Luka, People's Champion

Whenever a creature an opponent controls dies,
choose one that hasn't been chosen this turn:
• Put a +1/+1 counter on Luka. He fights target
creature an opponent controls
• Luka deals 3 damage to target opponent or
planeswalker
• Exile the top card of target player's library.
You may play that card this turn, and you may
spend mana as though it were mana of any
colour to cast it