Counter target spell. Untap up to four lands.

When Rib Collector enters, if a creature has died this turn, return target creature card from your graveyard to your hand.
Wander—{1}{B}, Sacrifice another creature.

Tap target creature. It can't become untapped for as long as you control a creature named Tidewake Walker.

Choose one —
• Exile target artifact or enchantment.
• Exile target creature you control, then return it to the battlefield under its owner's control. If that creature entering the battlefield causes any abilities to trigger, those abilities trigger an additional time.

Search your library for a card with flashback and exile it, then shuffle. You may cast that card this turn. At the beginning of your next end step, if that card is in exile, put it into your graveyard.
Flashback {U}{R}

Target creature gets +2/+0 and gains first strike until end of turn. It gets an additional +1/+0 until end of turn for each time you've amped it up this turn.

Amity — Whenever you attack with Rollephant and exactly one other creature, Rollephant gets +2/+2 until end of turn.

Whenever Rooftop Slink deals combat damage to a player, you may have each player discard a card.
Cybersoul {3}{B}

Lifelink
Landfall — Whenever a land you control enters, create a Berry token. You may attach it to Rooting Raccoon.

Vigilance
When Royal Templar enters, target creature gets +2/+0 and gains vigilance and indestructible until end of turn.
Cybersoul {3}{W}

{T}: Add {C}.
{4}: Rumbling Door becomes a 3/3 Golem creature with vigilance. It's still a land.

Flashback costs you pay cost {2} less.
{R}, {T}, Discard a card: Draw a card.

Reach
{1}, Sacrifice a land: Put a +1/+1 counter on Runerock Automaton.

Whenever you attack, defending player loses 2 life and you gain 2 life.

Players can't gain life.
Whenever a player casts a spell, Scathing Remarks deals 1 damage to that player for each of that spell's colors.

Trample
When Scourge of Capitalism enters, it fights target creature with the greatest power or tied for the greatest power among creatures you don't control. Excess damage is dealt to that creature's controller instead.

Flying
Creatures you control with base power 1 or less get +1/+0.

Scuttle Tank enters with a defender counter on it.

Surface {U}. Scuttling Cicada surfaces transformed.

When Seafloor Scavenger enters or deals combat damage to a player, you may return target exiled card with surface you own to your hand.

Flash
When Seal Away enters, exile target tapped creature an opponent controls until Seal Away leaves the battlefield.

At the beginning of each end step, create a 2/2 white and blue Seal Orb creature token if you activated two or more nonmana abilities this turn.
{W}{U}: Scry 1. You gain 1 life.

This spell costs {2} less to cast if you've activated a nonmana ability this turn.
Searing Grace deals 3 damage to any target.

Secluded Hangar enters tapped unless you control a basic non-Forest land.
{T}: Add {G}.
{2}, {T}: Put a +1/+1 counter on target creature that entered this turn.

Flash
When Security Initiative enters, you may tap or untap target nonland permanent. Then draw a card.
An opponent controls three or more tapped nonland permanents.