First strike
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

When Rotting Rats enters the battlefield, each player discards a card.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

: Add .
: Add one mana of any color. Spend this mana only to cast a spell that shares a watermark with Secret Base.

As Shimatsu the Bloodcloaked enters the battlefield, sacrifice any number of permanents. Shimatsu enters the battlefield with that many +1/+1 counters on it.

Destroy target land.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Reach
When Stingerfling Spider enters the battlefield, you may destroy target creature with flying.

Enchant creature
When Strands of Undeath enters the battlefield, target player discards two cards.
: Regenerate enchanted creature.

: Stream Hopper gains flying until end of turn.

Indestructible
As Stuffy Doll enters the battlefield, choose a player.
Whenever Stuffy Doll is dealt damage, it deals that much damage to the chosen player.
: Stuffy Doll deals 1 damage to itself.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Target creature gets -4/-4 until end of turn.

Roll a six-sided die. Put target nonland permanent into its owner's library just beneath the top X cards of that library, where X is the result.

Target creature gets +1/+0, becomes black, and gains shadow until end of turn. (It can block or be blocked by only creatures with shadow.)
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Trigon of Infestation enters the battlefield with three charge counters on it.
, : Put a charge counter on Trigon of Infestation.
, , Remove a charge counter from Trigon of Infestation: Create a 1/1 green Insect creature token with infect.

Whenever a creature token leaves the battlefield, put a +1/+1 counter on Twilight Drover.
, Remove a +1/+1 counter from Twilight Drover: Create two 1/1 white Spirit creature tokens with flying.

Gain control of target creature until end of turn. Untap that creature. It gets +X/+0 and gains haste until end of turn.

Mountaincycling , forestcycling (, Discard this card: Search your library for a Mountain or Forest card, reveal it, put it into your hand, then shuffle your library.)

When Wort, the Raidmother enters the battlefield, create two 1/1 red and green Goblin Warrior creature tokens.
Each red or green instant or sorcery spell you cast has conspire. (As you cast the spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose new targets for the copy.)