Double strike
When Drizzt Do’Urden enters, create Guenhwyvar, a legendary 4/1 green Cat creature token with trample.
Whenever a creature dies, if it had power greater than Drizzt’s power, put a number of +1/+1 counters on Drizzt equal to the difference.
Drizzt's last ability checks his power both at the time the creature dies and at the time the ability resolves. Notably, this means that if several creatures with power greater than Drizzt's die at the same time, Drizzt's ability will trigger that many times, but some of those abilities may not put counters on him as they resolve.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.