mtg.wtf

Cast this spell only if no permanents named Tidal Influence are on the battlefield.
Tidal Influence enters the battlefield with a tide counter on it.
At the beginning of your upkeep, put a tide counter on Tidal Influence.
As long as there is exactly one tide counter on Tidal Influence, all blue creatures get -2/-0.
As long as there are exactly three tide counters on Tidal Influence, all blue creatures get +2/+0.
Whenever there are four or more tide counters on Tidal Influence, remove all tide counters from it.

Tidal Kraken can't be blocked.

Tap up to three target creatures without flying.

Whenever Tidal Terror attacks, you may tap two other untapped creatures you control. If you do, Tidal Terror can't be blocked this turn.
Islandcycling {2}

{T}: Target creature becomes the color of your choice until end of turn.

{T}: Target land becomes an Island until end of turn.

Create a 5/5 blue Wall creature token with defender. Sacrifice it at the beginning of the next end step.

Devoid
Other colorless creatures you control get +0/+1.

Kicker {1}
When Tide Shaper enters the battlefield, if it was kicked, target land becomes an Island for as long as Tide Shaper remains on the battlefield.
Tide Shaper gets +1/+1 as long as an opponent controls an Island.

Flying
Whenever you attack with two or more creatures with flying, draw a card.

Whenever one or more creatures block, flip a coin. If you win the flip, each blocking creature is sacrificed by its controller. If you lose the flip, each blocked creature is sacrificed by its controller.

When Tidebinder Mage enters the battlefield, tap target red or green creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Tidebinder Mage.

{T}: Add {U}.

{U}, {T}: You may tap or untap another target creature.
Landfall — Whenever a land enters the battlefield under your control, you may untap Tideforce Elemental.

When Tidehollow Sculler enters the battlefield, target opponent reveals their hand and you choose a nonland card from it. Exile that card.
When Tidehollow Sculler leaves the battlefield, return the exiled card to its owner's hand.

Flying
Deathtouch

{2}{U}: Scry 1.

{T}: Target land becomes the basic land type of your choice until end of turn. Activate only during your turn.

Flying
Whenever you cast a spell, return target permanent to its owner's hand.

Tidewalker enters the battlefield with a time counter on it for each Island you control.
Vanishing
Tidewalker's power and toughness are each equal to the number of time counters on it.

Defender
{4}: Tidewater Minion loses defender until end of turn.
{T}: Untap target permanent.

Draw four cards.

Destroy target creature. You gain 1 life for each artifact you control.

Double team
Other Demons, Devils, Imps, and Tieflings you control get +1/+0.

Flash
Enchant creature
Enchanted creature gets +1/+1 and has trample.