Janus, Dragon of Crossroads

Flying, vigilance
Whenever an opponent casts a spell with an even converted mana cost, they may pay {2}. If they do
not, you may choose one that hasn't been chosen
this turn -
•Draw two cards, then discard a card.
•Untap target permanent you control, then tap
target permanent you don't control.
•Put two +1/+1 counters on Janus, Dragon of Crossroads.