Myrtex the Marsh Crawler

When Myrtex enters the battlefield, choose one:
•Scry 2.
•Put a +1/+1 counter on target creature.
Whenever you scry, you may pay {u}, if you do,
draw a card.
Whenever a +1/+1 counter is put on a creature,
you may pay {g}, if you do, it gains trample until end of turn.