Captivating Cave

{T}: Add {C}.
{1}, {T}: Add one mana of any color.
{4}, {T}, Sacrifice Captivating Cave: Put two +1/+1 counters on target creature. Activate only as a sorcery.

Mountain

Falkenrath Reaver

Shivan Dragon

Flying
{R}: This creature gets +1/+0 until end of turn.

Air Elemental

Ancient Crab

Island

River Sneak

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

Fling

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.

Tricks of the Trade

Enchant creature
Enchanted creature gets +2/+0 and can't be blocked.

Sphinx of Magosi

Flying
{2}{U}: Draw a card, then put a +1/+1 counter on Sphinx of Magosi.

Depths of Desire

Return target creature to its owner's hand. Create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Captivating Crew

{3}{R}: Gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn. Activate only as a sorcery.

Angler Drake

Flying
When Angler Drake enters, you may return target creature to its owner's hand.

Tilonalli's Knight

Whenever Tilonalli's Knight attacks, if you control a Dinosaur, Tilonalli's Knight gets +1/+1 until end of turn.

Terror of the Fairgrounds

Inspiration

Stealer of Secrets

Whenever Stealer of Secrets deals combat damage to a player, draw a card.

Frontline Rebel

Frontline Rebel attacks each combat if able.

Thundering Giant

Haste (This creature can attack and {T} as soon as it comes under your control.)

Brazen Scourge

Flame Lash

Unfriendly Fire

Unfriendly Fire deals 4 damage to any target.

Nimble Innovator

When Nimble Innovator enters, draw a card.

Sleep Paralysis

Enchant creature
When Sleep Paralysis enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Coral Merfolk

Renegade Tactics

Target creature can't block this turn.
Draw a card.

Shock

Wind Drake

Drag Under

Return target creature to its owner's hand.
Draw a card.

Wrangle

Gain control of target creature with power 4 or less until end of turn. Untap that creature. It gains haste until end of turn.

Hyena Pack

Sentinel Totem

When Sentinel Totem enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)
{T}, Exile Sentinel Totem: Exile all graveyards.

Charging Monstrosaur

Dive Down

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)