This alternate way of phasing out is known as phasing out "indirectly." An enchantment or Equipment that phased out indirectly won't phase in by itself, but instead phases in along with the card it's attached to
Creatures that share a creature type with equipped creature get +1/+1
Its unclear how effective this strategy will be in competitive Constructed formats, but the fact that Wildgrowth Walker still has potential earns it a spot on this list
If you are on the fence about the mastery pass let me give you two easy references to go by: If you reached the end of the Free track which is level 72, a Mastery Pass will give you: 1.400 gems, 7.500 gold, 14 boosters, 22 Orbs, 7 Mythic ICRs, 13 Card Styles, 5 Planeswalker cards If you do not have time to play that much and only reached level 43, this is what you get: 800 gems, 4.000 gold, 9 boosters, 11 Orbs, 3 Mythic ICRs, 7 Card Styles, 3 Planeswalker cards The only group that would not benefit from the rewards are Limited players that do not care about boosters, card styles, or pets
There will always be one player at the table who most threatens your life total, and most lifegain decks also want to keep life high for the likes of Aetherflux Reservoir or game-winning triggers