Aegor Rivers, Bittersteel

Whenever damage is dealt to Aegor Rivers, Bittersteel, deal that much damage to
target creature or plainswalker target opponent controls
When Aegor Rivers, Bittersteel deals combat
damage to a player that player sacrifices a
creature, if they cannot than that player discard
two cards, if they cannot target players life total becomes half of what it is rounded down.