Negate

Stormtide Leviathan

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can't attack.

Turn to Frog

Until end of turn, target creature loses all abilities and becomes a blue Frog with base power and toughness 1/1.

Reclamation Sage

When Reclamation Sage enters, you may destroy target artifact or enchantment.

Invasive Species

When Invasive Species enters, return another permanent you control to its owner's hand.

Coral Barrier

Defender (This creature can't attack.)
When Coral Barrier enters, create a 1/1 blue Squid creature token with islandwalk. (It can't be blocked as long as defending player controls an Island.)

Encrust

Enchant artifact or creature
Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.

Satyr Grovedancer

When Satyr Grovedancer enters, put a +1/+1 counter on target creature.

Mercurial Pretender

You may have Mercurial Pretender enter as a copy of a creature you control, except it has "{2}{U}{U}: Return this creature to its owner's hand."

Carnivorous Moss-Beast

{5}{G}{G}: Put a +1/+1 counter on Carnivorous Moss-Beast.

Plummet

Peel from Reality

Return target creature you control and target creature you don't control to their owners' hands.

Shaman of Spring

When Shaman of Spring enters, draw a card.

Fugitive Wizard

Frost Lynx

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

Into the Void

Return up to two target creatures to their owners' hands.

Kapsho Kitefins

Flying
Whenever Kapsho Kitefins or another creature you control enters, tap target creature an opponent controls.

Restock

Return two target cards from your graveyard to your hand. Exile Restock.

Island

Satyr Wayfinder

When Satyr Wayfinder enters, reveal the top four cards of your library. You may put a land card from among them into your hand. Put the rest into your graveyard.

Void Snare

Return target nonland permanent to its owner's hand.

Forest

Meteorite

When Meteorite enters, it deals 2 damage to any target.
{T}: Add one mana of any color.

Research Assistant

{3}{U}, {T}: Draw a card, then discard a card.

Runeclaw Bear

Roaring Primadox

At the beginning of your upkeep, return a creature you control to its owner's hand.