Phyrexian Altar

Sacrifice a creature: Add one mana of any color.

Blood Pet

Memnite

Shield Sphere

Defender
Whenever Shield Sphere blocks, put a -0/-1 counter on it.

Ornithopter

Enduring Renewal

Play with your hand revealed.
If you would draw a card, reveal the top card of your library instead. If it's a creature card, put it into your graveyard. Otherwise, draw a card.
Whenever a creature is put into your graveyard from the battlefield, return it to your hand.