Double Masters

Glassdust Hulk

Whenever another artifact enters the battlefield under your control, Glassdust Hulk gets +1/+1 until end of turn and can't be blocked this turn.
Cycling {WU} ({WU}, Discard this card: Draw a card.)

Whenever another artifact you control enters, Glassdust Hulk gets +1/+1 until end of turn and can't be blocked this turn.
Cycling {W/U} ({W/U}, Discard this card: Draw a card.)

Modern Masters 2015

Alara Reborn

Whenever another artifact comes into play under your control, Glassdust Hulk gets +1/+1 until end of turn and is unblockable this turn.
Cycling {WU} ({WU}, Discard this card: Draw a card.)