(4/17/2020) If you reveal a companion outside the game, for as long as it remains there, you may pay any time you could cast a sorcery (that is, you have priority during your main phase and the stack is empty)
But, before you start a run on the Walmarts and local card shops of the world, take note: this card wont be in draft or set booster packs but only in the slightly more expensive, English-language collector packs
Any Ezuri deck will do well in ramping up as much mana as you can possibly get, both to make sure you have enough to regenerate all your Elves at will, and to be able to use Ezuris second ability multiple times in a turn
As mentioned earlier, the best way is by casting your spells at instant speed, putting your creatures onto the battlefield without casting them, and stopping your opponents from casting multiple spells each turn
If an Adventure spell leaves the stack in any way other than resolving (most likely by being countered), that card won't be exiled and the spell's controller won't be able to cast it as a permanent later
