Thanatos, Prodigal Warlock

Companion — Your starting deck contains only
black and red cards, and land cards.
(If this card is your chosen companion, you may cast
it once from outside the game.)
When you cast your first black spell each turn,
target opponent reveals their hand. You choose a nonland card from it. That player discards that
card.
When you cast your first red spell each turn, you
may discard your hand. If you do, draw 3 cards.