mtg double faced cards sided card? : r/mtg Double-Faced Substitute Card · Kaldheim
Description
After any die is rolled, before applying the result of that die, there's an opportunity for you to use those effects

Upkeep Cost This mechanic isnt keyworded, but cards with an upkeep cost require you to pay a certain cost (usually mana) on your upkeep to keep that card in play

2020-04-17 Paying to put your companion into your hand is a special action

Well, that's up to you
