Baron Elliott, the Grand Mastermind

[AUTO] At the start of your opponent's battle phase, you may discard a card from your hand. If you discarded a black card, choose an opposing creature, and destroy it. If you discarded a blue card, choose an opposing creature, and return it to its owner's hand.

[AUTO] When this creature is [Dragocross (Black)], choose a blue or black creature from your discard pile, and return it to your hand. This ability can only activate once per turn.