Upgrade

Modular 3 (This creature enters the battlefield with
three +1/+1 counters on it. When it dies, you may put
its +1/+1 counters on target artifact creature.)

{t}: Target artifact you control becomes an artifact
creature with base power and toughness 0/0 and
gets +X/+X and haste until end of turn, where X
is its converted mana value plus 1.