+xr, +, +enters, +the, +battlefield, +tapped, +unless, +you, +control, +, +enters, +the, +battlefield, +tapped, +unless, +you, +control, +, +enters, +the, +battlefield, +tapped, +unless, +you, +control (4)
CARDNAME enters the battlefield tapped unless you control a white, blue, or black permanent.
: Add or .
Vigilance (Attacking doesn't cause this creature to tap.)
When this creature enters, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
This creature can't attack or block unless you control seven or more lands.
At the beginning of each end step, put a slime counter on each creature you don't control.
Creatures you don't control get -1/-1 for each slime counter on them.
Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token.
, Sacrifice a Slug: Draw a card.
Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
Gatherer works better in the Companion app!