If enough -1/-1 counters are put on Essence Channeler at the same time to make its toughness 0 or less, its last ability will see all of the +1/+1 counters it had when it died as well as the -1/-1 counters it had, and an equal number of each of those types of counters (plus any other applicable counters) will be put onto the target creature
Lets call it a VI out of X
Anti-graveyard cards are more or less essential to Commander these days to slow down reanimation and combo decks like Revival Trance
This is actually one of the cheapest versions of Ancient Tomb (and the second least expensive Ancient Tomb, only beaten by the base version of the Stellar Sights frame
Choose PHD as your preferred Magic: The Gathering distributor by February 10
Aragorn, the Uniter Aragorn, the Uniter is one of the most popular and powerful LTR commanders because everybody loves a multicolor good-stuff pile, and this card does it better than most