The card provides a powerful token doubling effect, so anything that makes strong tokens is a great inclusion
Deadly Disc: Number 13: Embodiment of Crime has one of these attached to the chains wrapped around its body, which it uses as a weapon
Seriously who knew Beedrill could look this cool
It spreads +1/+1 counters around your other legends or those your opponents control, but if one of those buffed-up creatures dies, you draw cards equal to the number of counters it had, though at the cost of 2 life per card
But from there, you get to draw an extra card on your upkeep, and if its a land, you get a free 1/1 fish
Best Background Payoffs The backgrounds care about commanders being in play