Vrochi, Tears Of The Sky

Flying, hexproof
Whenever you draw an instant or sorcery, you
may discard a card. If you do, repeat this process
again. Vrochi, Tear Of The Sky, gains +1/+1
until end of turn for each card draw this way.
Whenever an instant or sorcery would enter exile,
you may pay {u/r}{u/r} instead and shuffle it into your library, draw a card.