Waker of the Wilds

{X}{G}{G}: Put X +1/+1 counters on target land you control. That land becomes a 0/0 Elemental creature with haste. It's still a land.

River Sneak

This creature can't be blocked.
Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn.

Forest

Shaper Apprentice

This creature has flying as long as you control another Merfolk.

Prismatic Lens

{T}: Add {C}.
{1}, {T}: Add one mana of any color.

Tempest Caller

When this creature enters, tap all creatures target opponent controls.

Air Elemental

Unknown Shores

Aether Gale

Return six target nonland permanents to their owners' hands.

Island

Merfolk Sovereign

Other Merfolk creatures you control get +1/+1.
{T}: Target Merfolk creature can't be blocked this turn.

Deeproot Warrior

Whenever this creature becomes blocked, it gets +1/+1 until end of turn.

Soul of the Harvest

Trample
Whenever another nontoken creature you control enters, you may draw a card.

Vineshaper Mystic

When this creature enters, put a +1/+1 counter on each of up to two target Merfolk you control.

Shapers of Nature

{3}{G}: Put a +1/+1 counter on target creature.
{2}{U}, Remove a +1/+1 counter from a creature you control: Draw a card.

Kumena's Speaker

This creature gets +1/+1 as long as you control another Merfolk or an Island.

Giant Growth

Target creature gets +3/+3 until end of turn.

Unsummon

Return target creature to its owner's hand.

Threads of Disloyalty

Enchant creature with mana value 2 or less
You control enchanted creature.

Rancor

Enchant creature
Enchanted creature gets +2/+0 and has trample.
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

Jungle Barrier

Defender (This creature can't attack.)
When this creature enters, draw a card.

Vow of Flight

Enchant creature
Enchanted creature gets +2/+2, has flying, and can't attack you or planeswalkers you control.

Concentrate

Watertrap Weaver

When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Prey Upon

Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)