A-Thran Spider

(T: Add B.)

Flying When this creature enters, put a +1/+1 counter on another target Soldier you control.

Flying When this creature enters, mill three cards. You may put a Plains card or a creature card with mana value 3 or less from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on this creature. (To mill a card, put the top card of your library into your graveyard.)

Flash Flying 5: Creatures you control get +1/+1 until end of turn.

Exile all graveyards. Players can't cast noncreature spells this turn. Exile Calamity's Wake.

Deadly Riposte deals 3 damage to target tapped creature and you gain 2 life.

Destroy target artifact or enchantment.

When this creature enters, create a tapped Powerstone token for each other creature you control. (They're artifacts with "T: Add C. This mana can't be spent to cast a nonartifact spell.")