Underground River

T: Add C. T: Add W or B. This artifact deals 1 damage to you.

Thopters you control get +1/+1. If one or more artifact tokens would be created under your control, those tokens plus an additional 1/1 colorless Thopter artifact creature token with flying are created instead.

Equipped creature gets +1/+1 for each artifact you control. Whenever equipped creature attacks, look at the top six cards of your library. You may reveal an artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. Equip 3

At the beginning of your end step, you may exile target creature you control, then return that card to the battlefield under your control.

Creatures you control are every creature type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield. 3, T: Create a 2/2 blue Shapeshifter creature token with changeling. (It is every creature type.)

T: Add one mana of any color in your commander's color identity.

Flying At the beginning of each end step, put X +1/+1 counters on each creature you control, where X is the number of creatures that died under your control this turn.

Vigilance When this creature enters, draw cards equal to the number of Zombies you control or the number of Zombie cards in your graveyard, whichever is greater.