Pykrion, Dwarven Runesmith

Artificer 2 (When this creature enters the battlefield, scry 2, then reveal the top card of your library. If it's an artifact card, put it into your hand, then discard a card.)
Haste, Trample
Whenever Pykrion, Dwarven Runesmith deals combat damage to a player, you may cast an artifact card from your hand without paying its mana cost.