Omen of Draco

Domain — This spell costs less to cast for each basic land type among lands you control. Flying Domain — At the beginning of your upkeep, sacrifice this creature unless you pay . This cost is reduced by for each basic land type among lands you control.

Discard an artifact card: This creature gets +2/+2 until end of turn.

: Add . , : Put target artifact card from your graveyard on top of your library.

At the beginning of your end step, you may reveal the top card of your library. If you do, each opponent loses life equal to that card's mana value.