Ayara, Widow of the Realm [March of the Machine]

T, Sacrifice another creature or artifact: Ayara, Widow of the Realm deals X damage to target opponent or battle and you gain X life, where X is the sacrificed permanent's mana value.
5{R/P): Transform Ayara. Activate only as a sorcery. ((R/P) can be paid with either R or 2 life.)
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Ayara, Furnace Queen
At the beginning of combat on your turn, return up to one target artifact or creature card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step.