mtg exile cards Mirror of Fate - Magic 2010 #215 (English) the Gathering (MTG) trading and collectible card game (TCG/CCG) Legal in Vintage, Rules Text:

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That said, they were and remain popular, with many a Chandra deck in Commander helmed by Chandra, Fire of Kaladesh

Here you exile three and they are playable just on your turn, but that ability to make mana equal to the card count in your foe's hand can help you with that this turn

it certainly isnt as insanely powerful card, more a fun Commander style (I know, imagine playing a game to not just win on turn 2 with non-interaction) that really plays into your deck having a lot of Birds that you can filter in and out of your deck and graveyard

Agate Instigators close, but isnt indestructible, and like Slash, Reptile Rampager are comparable, but more expensive