Magic School, Sephirot (BT05/0037EN) (BT05)

[Cast Cost] [Pay 1 gauge]
[Set] (This card remains on the field.)
[Counter] [Act?]When your opponent casts a spell card, pay 1 life, and discard an "Art" from your hand. If you do, nullify the spell cast by your opponent. You may only use this ability once per turn.