mtg darksteel cards Magic the Gathering Booster Pack Artefact Card Number Darksteel Mutation (CMM-623) - Commander

Flying is most prominent in white and blue, so add cards against these colors if you have them

Can Tolaria West find Amulet of Vigor

This not only returns a horde of small creatures, it doesn't put exile counters on them or anything, so you could even do something like reanimate everything with this, including a Snapcaster Mage, giving the thing flash again instantly

Doubling Season Doubling Season from Ravnica: City of Guilds hasn't made much of a splash in 60-card formats, but it goes in many different Commander decks of all varities, because it straight-up doubles things players care about, like loyalty counters on Planeswalkers, for example

This doesn't seem wholly sufficient to explain the spike, otherwise why didn't it pop off during Bloomburrow, which brought in a popular new bird commander Kastral, the Windcrested