Paradox Engine

Whenever you cast a spell, untap all nonland permanents you control.

Invigorate

If you control a Forest, rather than pay this spell's mana cost, you may have an opponent gain 3 life.
Target creature gets +4/+4 until end of turn.

Surge of Salvation

You and permanents you control gain hexproof until end of turn. Prevent all damage that black and/or red sources would deal to creatures you control this turn.

Powerstone Shard

{T}: Add {C} for each artifact you control named Powerstone Shard.