You may spend mana as though it were mana of any color to activate abilities of creatures you control.
Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with Agatha's Soul Cauldron.
{T}: Exile target card from a graveyard. When a creature card is exiled this way, put a +1/+1 counter on target creature you control.
{1}
Amulet of Vigor
Artifact
Whenever a permanent enters the battlefield tapped and under your control, untap it.
{1}{U}
Aphetto Alchemist
Creature - Human Wizard
{T}: Untap target artifact or creature.
Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
1 /
2
{3}{U}{U}{U}
Arcanis the Omnipotent
Legendary Creature - Wizard
{T}: Draw three cards.
{2}{U}{U}: Return Arcanis the Omnipotent to its owner's hand.
3 /
4
--
Azorius Chancery
Land
Azorius Chancery enters the battlefield tapped.
When Azorius Chancery enters the battlefield, return a land you control to its owner's hand.
{T}: Add {W}{U}.
{2}
Crashing Drawbridge
Artifact Creature - Wall
Defender
{T}: Creatures you control gain haste until end of turn.
0 /
4
{1}{U}
Dramatic Reversal
Instant
Untap all nonland permanents you control.
{1}{U}
Dreamscape Artist
Creature - Human Spellshaper
{2}{U}, {T}, Discard a card, Sacrifice a land: Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.
1 /
1
{2}{W}
Drumbellower
Creature - Spirit
Flying
Untap all creatures you control during each other player's untap step.
2 /
1
{2}{U}
Emry, Lurker of the Loch
Legendary Creature - Merfolk Wizard
This spell costs {1} less to cast for each artifact you control.
When Emry, Lurker of the Loch enters the battlefield, mill four cards.
{T}: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)
1 /
2
--
Ghost Town
Land
{T}: Add {C}.
{0}: Return Ghost Town to its owner's hand. Activate only if it's not your turn.
{2}
Illusionist's Bracers
Artifact - Equipment
Whenever an ability of equipped creature is activated, if it isn't a mana ability, copy that ability. You may choose new targets for the copy.
Equip {3}
{1}{U}{U}
Jace's Archivist
Creature - Vedalken Wizard
{U}, {T}: Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.
2 /
2
{1}{U}
Jace, Vryn's Prodigy
Legendary Creature - Human Wizard
{T}: Draw a card, then discard a card. If there are five or more cards in your graveyard, exile Jace, Vryn's Prodigy, then return him to the battlefield transformed under his owner's control.
0 /
2
--
Jace, Telepath Unbound
Legendary Planeswalker - Jace
+1: Up to one target creature gets -2/-0 until your next turn.
-3: You may cast target instant or sorcery card from your graveyard this turn. If that spell would be put into your graveyard, exile it instead.
-9: You get an emblem with "Whenever you cast a spell, target opponent mills five cards."
0 /
2
{W}{U}
Kwain, Itinerant Meddler
Legendary Creature - Rabbit Wizard
{T}: Each player may draw a card, then each player who drew a card this way gains 1 life.
1 /
3
{2}
Lightning Greaves
Artifact - Equipment
Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip {0}
{2}{W}
Loran of the Third Path
Legendary Creature - Human Artificer
Vigilance
When Loran of the Third Path enters the battlefield, destroy up to one target artifact or enchantment.
{T}: You and target opponent each draw a card.
2 /
1
{2}{U}{U}{U}{U}
Mind Over Matter
Enchantment
Discard a card: You may tap or untap target artifact, creature, or land.
--
Oboro, Palace in the Clouds
Legendary Land
{T}: Add {U}.
{1}: Return Oboro, Palace in the Clouds to its owner's hand.
{2}{U}{U}
Opposition
Enchantment
Tap an untapped creature you control: Tap target artifact, creature, or land.
{2}{U}
Ovinomancer
Creature - Human Wizard
When Ovinomancer enters the battlefield, sacrifice it unless you return three basic lands you control to their owner's hand.
{T}, Return Ovinomancer to its owner's hand: Destroy target creature. It can't be regenerated. That creature's controller creates a 0/1 green Sheep creature token.
0 /
1
{U}{U}{U}
Patron Wizard
Creature - Human Wizard
Tap an untapped Wizard you control: Counter target spell unless its controller pays {1}.
2 /
2
{2}{U}
Retreat to Coralhelm
Enchantment
Landfall -- Whenever a land enters the battlefield under your control, choose one --
• You may tap or untap target creature.
• Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
{4}
Scaretiller
Artifact Creature - Scarecrow
Whenever Scaretiller becomes tapped, choose one --
• You may put a land card from your hand onto the battlefield tapped.
• Return target land card from your graveyard to the battlefield tapped.
1 /
4
{1}{U}{U}
Serendib Sorcerer
Creature - Human Wizard
{T}: Target creature other than Serendib Sorcerer has base power and toughness 0/2 until end of turn.
1 /
1
{1}{U}{U}
Sigil Tracer
Creature - Merfolk Wizard
{1}{U}, Tap two untapped Wizards you control: Copy target instant or sorcery spell. You may choose new targets for the copy.
2 /
2
{3}
Thousand-Year Elixir
Artifact
You may activate abilities of creatures you control as though those creatures had haste.
{1}, {T}: Untap target creature.
{1}{W}
To Arms!
Instant
Untap all creatures you control.
Draw a card.
{U}{U}
Vedalken Mastermind
Creature - Vedalken Wizard
{U}, {T}: Return target permanent you control to its owner's hand.
1 /
2
{2}{U}
Verity Circle
Enchantment
Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card.
{4}{U}: Tap target creature without flying.
{2}
Walking Atlas
Artifact Creature - Construct
{T}: You may put a land card from your hand onto the battlefield.
1 /
1
{2}{W}
White Plume Adventurer
Creature - Orc Cleric
When White Plume Adventurer enters the battlefield, you take the initiative.
At the beginning of each opponent's upkeep, untap a creature you control. If you've completed a dungeon, untap all creatures you control instead.
3 /
3
{1}{W}{U}
Will, Scion of Peace
Legendary Creature - Human Wizard
Vigilance
{T}: Spells you cast this turn that are white and/or blue cost {X} less to cast, where X is the amount of life you gained this turn. Activate only as a sorcery.
2 /
4
{4}{W}
Elesh Norn, Mother of Machines
Legendary Creature - Phyrexian Praetor
Vigilance
If a permanent entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Permanents entering the battlefield don't cause abilities of permanents your opponents control to trigger.
4 /
7
{W}
Giver of Runes
Creature - Kor Cleric
{T}: Another target creature you control gains protection from colorless or from the color of your choice until end of turn.
1 /
2
{2}{U}
Intruder Alarm
Enchantment
Creatures don't untap during their controllers' untap steps.
Whenever a creature enters the battlefield, untap all creatures.
{W}
Mother of Runes
Creature - Human Cleric
{T}: Target creature you control gains protection from the color of your choice until end of turn.
1 /
1
{4}{U}{ // }{1}{U}
Virtue of Knowledge // Vantress Visions
Enchantment // Instant - Adventure
If a permanent entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Copy target activated or triggered ability you control. You may choose new targets for the copy.