edhseer Commander synergy, explained
Instant — Trap
Mana cost: {2}{U}{U}
If an opponent had a green creature enter the battlefield under their control this turn, you may pay {U} rather than pay this spell's mana cost.
Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.
on-cast —
on-cast — keeps permanents from untapping
Causes: tap a creature.
Cares about: nothing.
a creature becomes tapped — 565 cards in the game can cause this (Permafrost Trap is one).
When a creature becomes tapped thanks to Permafrost Trap:
11 other cards care about it too. These are the ones with the most connections.
anything becomes tapped — 699 cards in the game can cause this (Permafrost Trap is one).
1 other card cares about it too. These are the ones with the most connections.
an instant is cast — 3,931 cards in the game can cause this (Permafrost Trap is one).
When Permafrost Trap is cast:
427 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 (Permafrost Trap is one).
When Permafrost Trap is cast:
5 other cards care about it too. These are the ones with the most connections.