This Modern Horizons III fox advisor enshrines a spot on this list by drawing cards upon casting auras, a little restricted, but you modify permanents all the time with enchantress decks
This ridiculously powerful ability can accelerate you so far beyond your opponents that, short of an immediate answer, it can be near impossible to come back from
Green hasn't seen much play in the format for a while, but having a mana dork as good as the Elves could be enough to see it stage a comeback
Only fine craftsmanship and friction keep this box secure and your cards safe on your travels
That said, I suspect Dreadhorde Invasion, given the easy comparison to Bitterblossom, will not fly under the radar for long
Losing a partner ability during the game doesn't cause either to cease to be your commander