Yawgmoth Compleat

Each creature you control gets +X/+X, where X is twice the number of -1/-1 counters on that creature.
{p/c}: Put a -1/-1 counter on target nonartifact creature. It becomes an artifact in addition to its other types.
{p/r}{p/r}: Gain control of target artifact creature until end of turn. It gains haste.
{p/g}: Remove all counters from target creature.