Urza, Chief Artificer AVR {T}: You may put a

{T}: You may put a land card from your hand onto the battlefield tapped

you may pay {2}

Sacrifice a land: Target creature you control gains shroud until end of turn

" (You may cast instant and sorcery cards from your graveyard by discarding a land card in addition to paying their other costs

Whenever you cast a Zombie spell

Urza, Chief Artificer AVR {T}: You may put aAffinity for artifact creatures (This spell costs {1} less to cast for each artifact creature you control.) Artifact creatures you control have menace. At the beginning of your end step, create a 0 0 colorless Construct artifact creature token with "This token gets +1 +1 for each artifact you control."