mtg mentor cards of the Meek Core Set 2019 Prerelease | Magic Partner—Character select (You can have two commanders if both have this ability.) Mentor - MTG Mechanics Explained

Yet Another Aether Vortex and Zzzyxass Abyss are kind of cool in theory, but does anyone really want to go to the trouble of building around them

I do think they want to slide back and forth through different expressions and play the one that suits their needs at that given time. Of course the Historic format was already unique to Arena as well, if technically playable with paper cards

1 Ebon Stronghold

We can arrange a time to pick up the cards and set up cash or paypal payment.

Even if you just have a few mana sources up after casting it you can now tap them for triple mana to essentially give you another turn