edhseer Commander synergy, explained
Artifact
Mana cost: {2}
You may choose a creature card in your hand whose mana cost could be paid by some amount of, or all of, the mana you spent on {X}. If you do, you may cast that card face down as a 2/2 creature spell without paying its mana cost. If the creature that spell becomes as it resolves has not been turned face up and would assign or deal damage, be dealt damage, or become tapped, instead it's turned face up and assigns or deals damage, is dealt damage, or becomes tapped. Activate only as a sorcery.
activated {X} —
activated {X} — turns something into a creature
Causes: cast a creature, a creature is turned face up.
Cares about: nothing.
a creature is turned face up — 238 cards in the game can cause this (Illusionary Mask is one).
an artifact is cast — 3,683 cards in the game can cause this (Illusionary Mask is one).
When Illusionary Mask is cast:
271 other cards care about it too. These are the ones with the most connections.
a nontoken artifact enters the battlefield — 3,768 cards in the game can cause this (Illusionary Mask is one).
When Illusionary Mask enters:
an artifact enters the battlefield — 4,643 cards in the game can cause this (Illusionary Mask is one).
When Illusionary Mask enters:
55 other cards care about it too. These are the ones with the most connections.
a creature is cast — 18,010 cards in the game can cause this (Illusionary Mask is one).
When a creature is cast thanks to Illusionary Mask:
81 other cards care about it too. These are the ones with the most connections.
anything enters the battlefield — 26,499 cards in the game can cause this (Illusionary Mask is one).
When Illusionary Mask enters:
39 other cards care about it too. These are the ones with the most connections.
anything is cast — 31,128 cards in the game can cause this (Illusionary Mask is one).
9 other cards care about it too. These are the ones with the most connections.