edhseer Commander synergy, explained
Legendary Creature — Mutant Hero
Mana cost: {2}{U}
Flying
When Justice enters, return up to one target nonland, nontoken permanent to its owner's hand.
triggered — bounce
Whenever another nonland permanent you control is returned to its owner's hand, put a +1/+1 counter on Justice.
triggered — puts a counter on it
Causes: a nontoken artifact leaves the battlefield, a nontoken battle leaves the battlefield, a nontoken creature leaves the battlefield, a nontoken enchantment leaves the battlefield, a nontoken planeswalker leaves the battlefield, put a counter on anything.
Cares about: nothing.
a Mutant enters the battlefield — 55 cards in Justice's colors can cause this (Justice is one).
a Hero enters the battlefield — 59 cards in Justice's colors can cause this (Justice is one).
a creature gets a counter — 380 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik gets a counter:
1 other card cares about it too. These are the ones with the most connections.
a creature attacks — 3,238 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik attacks:
43 other cards care about it too. These are the ones with the most connections.
anything attacks — 3,238 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik attacks:
2 other cards care about it too. These are the ones with the most connections.
a creature blocks — 3,238 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik blocks:
1 other card cares about it too. These are the ones with the most connections.
a creature is cast — 3,254 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik is cast:
12 other cards care about it too. These are the ones with the most connections.
a nontoken creature enters the battlefield — 3,316 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik enters:
2 other cards care about it too. These are the ones with the most connections.
a creature enters the battlefield — 3,581 cards in Justice's colors can cause this (Justice is one).
When Justice, Vance Astrovik enters:
32 other cards care about it too. These are the ones with the most connections.