Roiling Horror's power and toughness are each equal to your life total minus the life total of an opponent with the most life.
Suspend X—. X can't be 0. (Rather than cast this card from your hand, you may pay and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)
Whenever a time counter is removed from Roiling Horror while it's exiled, target player loses 1 life and you gain 1 life.

Rough deals 2 damage to each creature without flying.

Destroy target nonwhite permanent.

: Target creature gets -2/-0 until end of turn.

Sacrifice Seal of Primordium: Destroy target artifact or enchantment.

: Target creature other than Serendib Sorcerer has base power and toughness 0/2 until end of turn.

Flying, vigilance

Enchant creature
Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1.

: Shade of Trokair gets +1/+1 until end of turn.
Suspend 3— (Rather than cast this card from your hand, you may pay and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Shaper Parasite is turned face up, target creature gets +2/-2 or -2/+2 until end of turn.

Shivan Meteor deals 13 damage to target creature.
Suspend 2— (Rather than cast this card from your hand, you may pay and exile it with two time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.)

Trample
When Shivan Wumpus enters the battlefield, any player may sacrifice a land. If a player does, put Shivan Wumpus on top of its owner's library.

Target opponent chooses a card in your graveyard. You may pay . If you do, repeat this process except that opponent can't choose a card already chosen for Shrouded Lore. Then put the last chosen card into your hand.

Exile Simian Spirit Guide from your hand: Add .

All Sliver creatures get +1/+1.

Skirk Shaman can't be blocked except by artifact creatures and/or red creatures.

, , Discard a card: You gain 2 life for each card in your hand.

Counter target instant or sorcery spell. Its controller reveals cards from the top of their library until they reveal an instant or sorcery card. That player may cast that card without paying its mana cost. Then the player shuffles their library.

All Sliver creatures have first strike.

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When Stingscourger enters the battlefield, return target creature an opponent controls to its owner's hand.