Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)
0 /
1
{1}{G}
Essence Symbiote
Creature - Beast
Whenever a creature you control mutates, put a +1/+1 counter on that creature and you gain 2 life.
2 /
2
{2}{G}
Hydra's Growth
Enchantment - Aura
Enchant creature
When Hydra's Growth enters the battlefield, put a +1/+1 counter on enchanted creature.
At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.
{1}{G}
Incubation Druid
Creature - Elf Druid
{T}: Add one mana of any type that a land you control could produce. If Incubation Druid has a +1/+1 counter on it, add three mana of that type instead.
{3}{G}{G}: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)
0 /
2
{3}{G}{U}
Oko's Hospitality
Instant
Creatures you control have base power and toughness 3/3 until end of turn. You may search your library and/or graveyard for a card named Oko, the Trickster, reveal it, and put it into your hand. If you search your library this way, shuffle.
{4}{G}{U}
Oko, the Trickster
Legendary Planeswalker - Oko
+1: Put two +1/+1 counters on up to one target creature you control.
0: Until end of turn, Oko, the Trickster becomes a copy of target creature you control. Prevent all damage that would be dealt to him this turn.
-7: Until end of turn, each creature you control has base power and toughness 10/10 and gains trample.
L:
4
{1}{U}
Pollywog Symbiote
Creature - Frog
Each creature spell you cast costs {1} less to cast if it has mutate.
Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.
1 /
3
{G}{G}{G}
Predator Ooze
Creature - Ooze
Indestructible
Whenever Predator Ooze attacks, put a +1/+1 counter on it.
Whenever a creature dealt damage by Predator Ooze this turn dies, put a +1/+1 counter on Predator Ooze.
1 /
1
{1}{G}
Silhana Ledgewalker
Creature - Elf Rogue
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Silhana Ledgewalker can't be blocked except by creatures with flying.