msem-instigator

Haste
Desecrate (When this creature enters, you may sacrifice an artifact or land.)
When Bloodboil Harlequin desecrates a permanent, up to two target creatures can't block this turn.

Frenzy 1 (Whenever this creature attacks and isn't blocked, it gets +1/+0 until end of turn.)

Whenever Bold Vanquisher attacks, upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Trample

Whenever Burning Hart deals combat damage to a player, it deals that much damage to up to one target planeswalker that player controls.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Resolute — At the beginning of combat on your turn, if Crazed Swashbuckler's power is greater than its base power, it deals 1 damage to target creature defending player controls. That creature can't block this turn.

Trample
Whenever Crazed Wildlings deals combat damage to a player, create a 1/1 red Goblin creature token.

When Crimson Curtain Favored enters, starting with you, each player may discard any number of cards. When each player is finished discarding, choose one —
• Crimson Curtain Favored deals damage to each player equal to the number of cards in their hand.
• Each player draws a card for each card they discarded this way.

Adorned — Daelish Hopeful has first strike as long as it's equipped and/or enchanted.

Haste
Whenever Emblazoned Qilin attacks, it gains flying until end of turn if it's in a pack. (Two or more creatures you control with equal power are in a pack.)

Haste
Whenever Flamewake Elk attacks, you may put a +1/+1 counter on another target attacking creature.

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
Once each turn, when a Curse you control becomes attached to an opponent, you may sacrifice it. If you do, reveal cards from the top of your library until you reveal a Curse card. Put that card onto the battlefield attached to that player, and the rest on the bottom of your library in a random order.

Haste

Motivate 3 (When this creature enters, you may motivate target creature with less power than this by putting three +1/+1 counters on it.)
When General Merthilios motivates a creature, that creature gains first strike, trample, and haste until end of turn.

Flying
Ward—Pay 4 life.
Augmented — At the beginning of each end step, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, return HO-20 Rising Sun from your graveyard to the battlefield tapped.

When Ironsmash Wrecker enters, you may destroy target artifact.

Haste (This creature can attack and {T} as soon as it comes under your control.)

{R}, Discard a card: Target creature blocking Scaled Mindreaver gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Scholar of the Staff can't block.
Inspired — Whenever Scholar of the Staff becomes untapped, up to one target creature can't block this turn.

When Trepid Deserters enters, target creature you control gets +2/+0 until end of turn.

Haste
When Vidal enters, reveal cards from the top of your library until you reveal an enchantment card with mana value 3 or less. Put that card onto the battlefield and the rest on the bottom of your library in a random order. Sacrifice that enchantment at the beginning of the next end step.

When Volcano Elemental dies, it deals 2 damage to any target.

Revive {3}{G} ({3}{G}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

When Attuned Ancient enters, if you control a legendary creature, you may have Attuned Ancient deal damage equal to its power to target creature an opponent controls.

Trample