TT only one rare card per deck?

[Niwashi]

You can get to play unlimited ** cards once you've acquired 30 total, and unlimited *** once you've gotten 60 cards. But you'll still be limited to one ****/***** card

Presumably there are levels that would unlock unlimited 4 and 5 star cards as well (like 90 cards gives you unlimited 4's and 120 gives you unlimited 5's, or maybe they'll ramp up the requirements more for higher tiers). But there are currently only 80-some cards in the game so far, so those higher unlocks aren't available yet. SE is planning to add more cards, though, so not only will that bring up the possibility of higher-level unlocks for what can go in a deck, but the initial 30 and 60 card unlock requirements will get easier to achieve as well.