msem-instigator

Menace (This creature can't be blocked except by two or more creatures.)

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.

Shuffle your library, then exile cards from the top until you've exiled cards with total mana value greater than or equal to X. You may play those cards until the end of your next turn. Add X mana of any one color.
Exile Final Ballad.

Trample, haste

Spearhead deals X damage to target player. (Then exile this card. You may cast the creature later from exile.)

When Improvisionist enters the battlefield, if it was the second spell you cast this turn, exile the top card of your library. You may play that card until the end of your next turn.

Whenever Karoa, His Roaring Grace deals combat damage to a player, if he's not equipped, create a colorless Equipment artifact token named Banner attached to him. The token has equip {1} and “Equipped creature gets +1/+1.”

Whenever you cast an instant, sorcery, or Wizard spell, Leafdown Sizzlemage gets +1/+0 until end of turn.

Add two mana in any combination of colors. (Then exile this card. You may cast the creature later from exile.)

Enchant creature
As Legacy of Dawn Hill enters the battlefield, choose a creature type.
Enchanted creature gets +2/+0, has first strike, and is the chosen type in addition to its other types.

Menagerie — When Lurking Feralynx enters the battlefield, if there are five or more creature types among creatures you control, you may search your library for a card named Lurking Feralynx, reveal it, put it into your hand, then shuffle.

Choose one —
• Destroy target artifact.
• Metal Munch deals 1 damage to each of up to two targets.

Double strike

Target creature gets +2/+1 until end of turn. (Then exile this card. You may cast the creature later from exile.)

You may pay {R} and tap an untapped Warrior you control rather than pay this spell's mana cost.
Choose one —
• Double the power of target creature you control until end of turn.
• Target creature you control deals damage equal to its power to target creature or planeswalker.

Whenever you attack with one or more Pirates, create that many 1/1 white Bird creature tokens with flying that are tapped and attacking. At end of combat, choose one of those tokens, then exile the rest.

Haste (This creature can attack and {T} as soon as it comes under your control.)
Olson's Sky Brigade has flying as long as you control another attacking Pirate.

Exile cards from the top of your library until you exile a nonland card. You may play one of those cards from exile until the end of your next turn.

{R}: Paw Valley Wildclaw gets +1/+0 until end of turn. Then if its power is exactly 4, add {R}{R}{R}.

Target creature gains double strike and trample until end of turn. (Then exile this card. You may cast the creature later from exile.)

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you cast your second spell each turn, add a quest counter.
1 — Exile the top card of your library. You may play that card until the end of your next turn.
2 — The second spell you cast during your next turn cost {1} less to cast.
3 — You may cast target instant or sorcery card from your graveyard this turn. When you do, copy it. You may choose new targets for the copy.

Discard your hand, then for each creature you control that dealt combat damage to a player this turn, draw a card and create a Treasure token.
{1}{R}, Tap an untapped Pirate you control, Discard Pieces of Eight: Create a 2/1 black and red Cat Pirate creature token with menace.

{T}: Pyrespike Familiar deals 1 damage to target player or planeswalker.
Menagerie — As long as there are five or more creature types among creatures you control, if a red source you control would deal damage, it deals that much damage plus 1 instead.

Haste (This creature can attack and {T} as soon as it comes under your control.)
Quick Brown Fox can't be blocked by Hounds.

Gain control of up to two target creatures until end of turn. Untap them. They gain haste until end of turn.
Menagerie — If there are five or more creature types among creatures you control, untap all creatures you control. Until end of turn, they gain “{T}: This creature fights another target creature.”