Saihra, Mage of Knowledge

{3}: You gain 3 life, scry 2, and draw a card. Put a knowledge counter on Saihra, Mage of
Knowledge. Any player may activate this ability. Opponents can't activate this ability on your
turn.
At the beginning of your upkeep, you gain X life
and scry X, where X is the number of knowledge counters on Saihra. Then, remove all knowledge counters from Saihra, Mage of Knowledge.