Mirkwood Channeler isnt really a Modern viable card either
2021-02-05 You unattach Toralf's Hammer as part of the cost of activating the ability
It seems very unlikely that the consistency you lose from playing 20 extra cards will decrease your odds of winning by 10% or more, which would mean even discounting any specific Yorion, Sky Nomad synergy, it would be correct for a lot of decks to add some extra cards to meet the Bird Serpent's companion restriction
1x Foil Left-Handed Garruk, Caller of Beasts
Instead of leaving them unused, you can disenchant (or recycle) them for CPP
At the beginning of each end step, create X 1/1 black Rat creature tokens with "This creature gets +1/+1 for each other Rat you control," where X is the number of creatures your opponents controlled that were exiled this turn