they can't balance the game as it is, so making ultra powerful cards that aren't allowed in your deck right off the bat is going to end up completely broken.
Research // Development lets you shuffle sideboard cards into your library and doesn't see play (except just maybe in casual). Assuming the only way to get "forbidden" cards into the game remains shuffling them into your library, a la some of the playtest cards letting you create token cards and shuffle them into your library, I think they're more likely to be unplayably bad than broken, even if you get to shuffle in 4 Time Walks. The chance that you draw any one card of a full playset, assuming you don't have any of that playset in your opening hand, is deceptively low.
The "cards that can't go in your deck" remind me of the token cards mentioned in the playtest cards. Given the insane power level of the cards alluded to in the "cards that can't go in your deck" section and the token cards (e.g. Time Walk), this makes sense.
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Research // Development lets you shuffle sideboard cards into your library and doesn't see play (except just maybe in casual). Assuming the only way to get "forbidden" cards into the game remains shuffling them into your library, a la some of the playtest cards letting you create token cards and shuffle them into your library, I think they're more likely to be unplayably bad than broken, even if you get to shuffle in 4 Time Walks. The chance that you draw any one card of a full playset, assuming you don't have any of that playset in your opening hand, is deceptively low.