edhseer Commander synergy, explained
Instant
Mana cost: {1}{R}{R}
You and target spell's controller bid life. You start the bidding with a bid of 1. In turn order, each player may top the high bid. The bidding ends if the high bid stands. The high bidder loses life equal to the high bid. If you win the bidding, counter that spell.
on-cast —
Causes: counter a spell.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Mages' Contest is one).
When Mages' Contest 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 (Mages' Contest is one).
When Mages' Contest is cast:
5 other cards care about it too. These are the ones with the most connections.