Horn of Plenty
{6}
Artifact
Oracle Text
Whenever a player casts a spell, they may pay {1}. If the player does, they draw a card at the beginning of the next end step.
Watch Out
Cast trigger fires even if counteredWatch Out
This triggers when the spell is cast, before it resolves. Even if the spell is countered, the cast trigger still resolves. Copies of spells are not cast, so they won't trigger this.