Rivals of Ixalan

At the beginning of combat on your turn, put a +1/+1 counter on target creature you control. Then if that creature has three or more +1/+1 counters...

When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle your library and put...

Enrage — Whenever Siegehorn Ceratops is dealt damage, put two +1/+1 counters on it. (It must survive the damage to get the counters.)

Other Merfolk you control get +1/+1.

When Cherished Hatchling dies, you may cast Dinosaur spells this turn as though they had flash, and whenever you cast a Dinosaur spell this turn, i...

When Jungleborn Pioneer enters the battlefield, create a 1/1 blue Merfolk creature token with hexproof. (It can't be the target of spells or abilit...

Destroy target artifact or enchantment.

Enrage — Whenever Siegehorn Ceratops is dealt damage, put two +1/+1 counters on it. (It must survive the damage to get the counters.)

Whenever Raging Regisaur attacks, it deals 1 damage to any target.

{3}{B}{G}: Return Jungle Creeper from your graveyard to your hand.

Flash When Swift Warden enters the battlefield, target Merfolk you control gains hexproof until end of turn. (It can't be the target of spells or ...

Put two +1/+1 counters on each creature you control.

Destroy target creature with flying.

Enrage — Whenever Overgrown Armasaur is dealt damage, create a 1/1 green Saproling creature token.

When Jadecraft Artisan enters the battlefield, target creature gets +2/+2 until end of turn.

When Jade Bearer enters the battlefield, put a +1/+1 counter on another target Merfolk you control.

As long as it's your turn, Hardy Veteran gets +0/+2.

Giltgrove Stalker can't be blocked by creatures with power 2 or less.

When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on...

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Target creature gets +1/+1 until end of turn. Draw a card.

Enrage — Whenever Overgrown Armasaur is dealt damage, create a 1/1 green Saproling creature token.

Destroy target artifact or enchantment.