This is going to be bonkers in Commander, though, protecting things from board wipes, poofing Voltron attackers, blanking blockers
While Kaalia works with all three of these creature types, if a player wanted to go all in on a Mardu Dragon deck while ignoring demons and angels, Kaalia could enable such a strategy quite well
The official statement around the announcement on the Magic site says the company has "trapped Marvel's loud-mouthed mercenary in a Magic card that is just stable enough to be legal in Eternal formats." The deck contains five cards and Deadpool's abilities are, as expected, meta as all heck
This often will use the full Vintage legal card pool, such as the Power 9 cards like Black Lotus and Ancestral Recall, hence the name
Some treefolk already gain life when they ETB, and Treebeard should be a perfect addition to an EDH lifegain, treefolk, or toughness-matters deck
The Alchemy version, Thayan Evokers, ditches most of this design altogether for something entirely different, though double team does a fine myriad impression