edhseer Commander synergy, explained
Legendary Creature — Mutant Hero
Mana cost: {1}{R}
Haste
Whenever you cast a noncreature spell, you may pay {1}.
triggered —
When you do, target creature with haste can't be blocked this turn except by creatures with haste.
triggered — restricts what can block it
Causes: nothing.
Cares about: an artifact is cast, a battle is cast, an enchantment is cast, an instant is cast, a planeswalker is cast, a sorcery is cast.
cast a battle — 24 cards in Speed's colors can cause this.
14 other cards cause it too. These are the ones with the most connections.
cast a planeswalker — 64 cards in Speed's colors can cause this.
59 other cards cause it too. These are the ones with the most connections.
a Hero creature it grants types to — 75 cards in Speed's colors can cause this.
74 other cards cause it too. These are the ones with the most connections.
a Hero enters the battlefield — 78 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger enters:
cast an enchantment — 574 cards in Speed's colors can cause this.
572 other cards cause it too. These are the ones with the most connections.
cast an artifact — 2,477 cards in Speed's colors can cause this.
2,467 other cards cause it too. These are the ones with the most connections.
a creature attacks — 3,451 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger attacks:
58 other cards care about it too. These are the ones with the most connections.
a creature blocks — 3,451 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger blocks:
1 other card cares about it too. These are the ones with the most connections.
anything attacks — 3,451 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger attacks:
19 other cards care about it too. These are the ones with the most connections.
a creature is cast — 3,468 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger is cast:
10 other cards care about it too. These are the ones with the most connections.
a nontoken creature enters the battlefield — 3,511 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger enters:
a creature enters the battlefield — 3,801 cards in Speed's colors can cause this (Speed is one).
When Speed, Young Avenger enters:
57 other cards care about it too. These are the ones with the most connections.