Buff Buffington the Buffer

X is the number of +1/+1 counters on creatures
you control.
+1/+1 counters on creatures you control give
those creatures +2/+2 instead.
{t}: Put a +1/+1 counter on target creature if it's
the only attacking creature and up to one other
target untapped creature.
*Doot* *Doot*
"Bigger rhymes with bigger so get bigger"