Double strike

Eternalize {3}{W}{W} ({3}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Cat with no mana cost. Eternalize only as a sorcery.)

Whenever an enchantment enters the battlefield under your control, create a 2/2 white Cat creature token. If that enchantment is an Aura, you may attach it to the token.

Whenever you gain life, put a +1/+1 counter on Ajani's Pridemate.

Whenever a creature you control enters, you gain 1 life.

Whenever Angelic Cub becomes the target of a spell or ability for the first time each turn, put a +1/+1 counter on it.

As long as Angelic Cub has three or more +1/+1 counters on it, it has flying.

{T}: Add one mana of any color in your commander's color identity.

Whenever a creature enters the battlefield under your control, you may destroy target artifact or enchantment.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

When Basri's Acolyte enters, put a +1/+1 counter on each of up to two other target creatures you control.

As an additional cost to cast this spell, sacrifice a creature or pay {3}.

Destroy target permanent. Its controller creates a 3/3 green Beast creature token.

Haste (This creature can attack and {T} as soon as it comes under your control.)

Whenever Bolt Hound attacks, other creatures you control get +1/+0 until end of turn.

{1}, {T}: Add {R}{W}.

Bountiful Promenade enters the battlefield tapped unless you have two or more opponents.

{T}: Add {G} or {W}.

Choose one --

• Cabaretti Charm deals damage equal to the number of creatures you control to target creature or planeswalker.

• Creatures you control get +1/+1 and gain trample until end of turn.

• Create two 1/1 green and white Citizen creature tokens.

You gain X life and draw X cards, where X is the number of creatures you control. Creatures you control get +1/+1 until end of turn.

({T}: Add {G} or {W}.)

Canopy Vista enters tapped unless you control two or more basic lands.

Whenever a creature you control enters, put a +1/+1 counter on each creature you control.

Lands you control have "{T}: Add one mana of any color."

{T}: Add one mana of any color.

({T}: Add {R} or {G}.)

Cinder Glade enters tapped unless you control two or more basic lands.

Choose one --

• Destroy all creatures.

• Destroy all artifacts and enchantments.

Clifftop Retreat enters tapped unless you control a Mountain or a Plains.

{T}: Add {R} or {W}.

Enchant creature

When Colossification enters, tap enchanted creature.

Enchanted creature gets +20/+20.

{T}: Add one mana of any color in your commander's color identity.

{T}: Add one mana of any color in your commander's color identity.

Sacrifice Commander's Sphere: Draw a card.

Choose target permanent card in your graveyard. If it has mana value 3 or less, you may put it onto the battlefield. If you don't put it onto the battlefield, put it into your hand.

You gain 3 life.

When Crazed Firecat enters the battlefield, flip a coin until you lose a flip. Put a +1/+1 counter on Crazed Firecat for each flip you won.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Flash

Creatures you control get +2/+2.

Search your library for a creature card, reveal that card, put it into your hand, then shuffle.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Other Cats you control get +1/+1 and have protection from Dogs.

Whenever one or more Cats you control deal combat damage to a player, destroy up to one target artifact or enchantment that player controls.

If you control a commander, you may cast this spell without paying its mana cost.

Creatures you control gain indestructible until end of turn.

Legendary creatures you control get +2/+1 and have ward {1}.

Nonlegendary creatures you control get +1/+1.

{T}: Add {C}.

{2}{G}{W}, {T}: Put a +1/+1 counter on each creature you control.

Destroy target permanent. Its controller creates a 3/3 green Elephant creature token.

First strike

Menace (This creature can't be blocked except by two or more creatures.)

{T}, Sacrifice Goldhound: Add one mana of any color.

{1}, {T}: Add {R}{G}.

Draw three cards.

As an additional cost to cast this spell, sacrifice a land.

Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

Creature tokens you control get +1/+1 and have vigilance.

({T}: Add {R}, {G}, or {W}.)

Jetmir's Garden enters the battlefield tapped.

Cycling {3} ({3}, Discard this card: Draw a card.)

Creatures you control get +1/+0 and have vigilance as long as you control three or more creatures.

Creatures you control also get +1/+0 and have trample as long as you control six or more creatures.

Creatures you control also get +1/+0 and have double strike as long as you control nine or more creatures.

If you would create one or more tokens, you may instead create that many 2/2 green Cat creature tokens with haste or that many 3/1 green Dog creature tokens with vigilance.

Jungle Shrine enters the battlefield tapped.

{T}: Add {R}, {G}, or {W}.

{T}: Add {C}.

{X}{R}{G}, {T}: Target creature gets +X/+0 and gains trample until end of turn.

Other Cats you control get +2/+1.

Your opponents can't cast spells during your turn.

Whenever one or more creatures you control each with power greater than its base power deals combat damage to a player, draw a card.

Whenever Leonin Warleader attacks, create two 1/1 white Cat creature tokens with lifelink that are tapped and attacking.

Your opponents can't cast spells during combat.

Whenever a creature you control deals combat damage to a player, goad each creature that player controls. (Until your next turn, those creatures attack each combat if able and attack a player other than you if able.)

Creatures you control get +1/+1.

Whenever you tap a land for mana, add one mana of any type that land produced.

First strike

Whenever Mirri, Weatherlight Duelist attacks, each opponent can't block with more than one creature this combat.

As long as Mirri, Weatherlight Duelist is tapped, no more than one creature can attack you each combat.

Changeling (This card is every creature type.)

{X}: Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.

Choose one --

• Naya Charm deals 3 damage to target creature.

• Return target card from a graveyard to its owner's hand.

• Tap all creatures target player controls.

Creatures you control get +3/+3 and gain trample until end of turn.

Other Dogs you control get +1/+1.

Whenever Pack Leader attacks, prevent all combat damage that would be dealt this turn to Dogs you control.

Creature tokens you control have haste.

Parley -- At the beginning of combat on your turn, each player reveals the top card of their library. For each land card revealed this way, you create a 1/1 green and white Citizen creature token. Then creatures you control get +1/+1 until end of turn for each nonland card revealed this way. Then each player draws a card.

Put a +1/+1 counter on each creature you control. You gain 1 life for each creature you control.

During your turn, creature tokens you control get +1/+4.

{3}{W}: Create a 1/1 white Soldier creature token.

Partner (You can have two commanders if both have partner.)

Other Cats you control get +1/+1 and have lifelink.

When Regal Caracal enters the battlefield, create two 1/1 white Cat creature tokens with lifelink.

You have no maximum hand size.

{T}: Add {C}.

Choose one --

• Draw cards equal to the greatest power among non-Human creatures you control.

• Non-Human creatures you control get +3/+3 until end of turn.

Whenever you cast a Dog spell, create a 1/1 green Cat creature token.

Whenever you cast a Cat spell, create a 1/1 white Dog creature token.

{R}{G}{W}, {T}: Rin and Seri, Inseparable deals damage to any target equal to the number of Dogs you control. You gain life equal to the number of Cats you control.

{T}: Add {C}.

{4}, {T}: Target creature can't be blocked this turn.

Populate. Creatures you control gain indestructible until end of turn. (To populate, create a token that's a copy of a creature token you control.)

Rootbound Crag enters tapped unless you control a Mountain or a Forest.

{T}: Add {R} or {G}.

For each token you control, create a token that's a copy of that permanent.

{1}, {T}: Add {G}{W}.

Sacrifice Selfless Savior: Another target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Draw a card for each creature you control.

Ferocious -- You gain 4 life for each creature you control with power 4 or greater.

{T}: Add {C}{C}.

When Spirited Companion enters, draw a card.

Sunpetal Grove enters tapped unless you control a Forest or a Plains.

{T}: Add {G} or {W}.

Until your next turn, your life total can't change and you gain protection from everything. All permanents you control phase out. (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.)

Exile Teferi's Protection.

{T}: Add {C}{C}. Activate only if you control five or more lands.

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

Other Dogs you control have unleash.

Creatures you control with counters on them have haste.

Whenever Tesak, Judith's Hellhound attacks, add {R} for each attacking creature.

Search your library for a Forest card, put it onto the battlefield, then shuffle.

Until end of turn, creatures you control get +5/+5 and gain first strike, trample, and lifelink.

Creatures you control gain indestructible until end of turn.

Addendum -- If you cast this spell during your main phase, put a +1/+1 counter on each of those creatures and they gain vigilance until end of turn.

Search your library for a creature card, reveal it, then shuffle and put the card on top.

Each land is a Forest in addition to its other land types.