Narle, The Night Waning

Partner with Isega, Scholar of the Forgotten
Trample, First Strike, Vigilance, Reach,
Deathtouch, Haste
Whenever you cast a spell converted mana
cost X, put X +1/+1 counters on Narle,
where X is Narle's power.
At the beginning of your end step,
sacrifice Narle unless you pay {2}.