mtg.wtf

{U}: Shore Snapper gains islandwalk until end of turn.

Target creature you control gets +1/+1 and gains hexproof until end of turn. Untap it.

{U}: Exile Shorecrasher Elemental, then return it to the battlefield face down under its owner's control.
{1}: Shorecrasher Elemental gets +1/-1 or -1/+1 until end of turn.
Megamorph {4}{U}

Whenever you cast a spell that's both green and blue, Shorecrasher Mimic has base power and toughness 5/3 until end of turn and gains trample until end of turn.

Shoreline Looter can't be blocked.
Threshold — Whenever Shoreline Looter deals combat damage to a player, draw a card. Then discard a card unless seven or more cards are in your graveyard.

Protection from Kavu

Flying
Islandcycling {2}

Whenever Shoreline Salvager deals combat damage to a player, if you control an Island, you may draw a card.

When Shoreline Scout enters the battlefield, you may exile a Merfolk card or a land card from your hand. If you do, conjure a card named Tropical Island into your hand.
As long as another Merfolk or an Island entered the battlefield under your control this turn, Shoreline Scout gets +1/+0.

{1}, {T}: Draw two cards, then discard a card. Create a 1/1 colorless Pilot creature token with "This creature crews Vehicles as though its power were 2 greater."
Crew 8
Shorikai, Genesis Engine can be your commander.

Equipped creature gets +1/+1 and has vigilance and reach.
Equip {1}

Flash
Enchant artifact or creature
As long as enchanted permanent is a creature, it gets -3/-0 and loses flying.

Equipped creature gets +1/+1.
Equip {1}

Whenever Shortcut Seeker deals combat damage to a player, venture into the dungeon.

When Shortcut to Mushrooms enters, the Ring tempts you.
At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on target creature you control.

Support 2.
Draw a card.

If you aren't the starting player, you may cast Shove Aside as though it had flash.
Shove Aside deals 3 damage to target creature or planeswalker.

Until end of turn, all creatures gain "{T}: Tap target creature."

Each player may put an artifact, creature, enchantment, or land card from their hand onto the battlefield.

When you cast this spell, copy it for each other instant and sorcery spell you've cast this turn. You may choose new targets for the copies.
Put a +1/+1 counter on target creature. It gains vigilance until end of turn.

Target creature gets +2/+4 until end of turn.

I — Exile the top four cards of your library. Until the end of your next turn, you may play those cards.
II, III — Whenever you cast a spell this turn, put a +1/+1 counter on target creature you control.

Destroy target artifact, enchantment, or creature with flying. Scry 1.

Shower of Coals deals 2 damage to each of up to three targets.
Threshold — Shower of Coals deals 4 damage to each of those permanents and/or players instead if seven or more cards are in your graveyard.