Flying, vigilance, haste

Whenever a nontoken creature you control attacks, create a 1/1 red Goblin creature token that's tapped and attacking.
Sacrifice Mardu Ascendancy: Creatures you control get +0/+3 until end of turn.

: Add , , or .
, , Sacrifice Mardu Banner: Draw a card.

When Mardu Blazebringer attacks or blocks, sacrifice it at end of combat.

Choose one —
• Mardu Charm deals 4 damage to target creature.
• Create two 1/1 white Warrior creature tokens. They gain first strike until end of turn.
• Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

: Mardu Hateblade gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Raid — When Mardu Heart-Piercer enters the battlefield, if you attacked this turn, Mardu Heart-Piercer deals 2 damage to any target.

Raid — When Mardu Hordechief enters the battlefield, if you attacked this turn, create a 1/1 white Warrior creature token.

Whenever Mardu Roughrider attacks, target creature can't block this turn.

Mardu Skullhunter enters the battlefield tapped.
Raid — When Mardu Skullhunter enters the battlefield, if you attacked this turn, target opponent discards a card.

Raid — When Mardu Warshrieker enters the battlefield, if you attacked this turn, add .

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 Master of Pearls is turned face up, creatures you control get +2/+2 until end of turn.

Draw a card. Master the Way deals damage to any target equal to the number of cards in your hand.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Meandering Towershell attacks, exile it. Return it to the battlefield under your control tapped and attacking at the beginning of the declare attackers step on your next turn.

Outlast (, : Put a +1/+1 counter on this creature. Outlast only as a sorcery.)
Each creature you control with a +1/+1 counter on it has deathtouch.

Counter target spell unless its controller pays . Mindswipe deals X damage to that spell's controller.

Flying
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 Mistfire Weaver is turned face up, target creature you control gains hexproof until end of turn.

Enchant creature
Enchanted creature gets +2/+0 and has ": Regenerate this creature."

Defender, flying
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)