You may cast up to two spells from among the other cards exiled this way without paying their mana costs. Basically, everyone exiles cards until they hit a nonland card, then one opponent can pick one of those cards, which you cant choose
Removing a key threat can immediately swing momentum, but the temporary card access given to both players means the spells true value depends on when and how it's used
Basically, Miraidon ex is great, but the true reason why it will see so much play is yet to appear on this list
For example, the last ability will count experience counters that you got from the second ability, from another ability, from another copy of Azula, Ruthless Firebender, and so on
When its bud starts to open, that means spring is right around the corner.