Konami tried banning the smaller dragons with the hope of hurting their consistency, eventually limiting the boss monsters to one copy per deck before banning all the Dragon Rulers outright
And then there are the playtest cards: the wonderfully broken, never-legal-anywhere experiments that make an MB2 table erupt in laughter
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Since it leaves the battlefield, it will be summoning sick when it returns, so you can't transform Terra into Esper Terra the turn it reverts
Its effect is fairly meh, especially in a deck that's pretty much 50% removal
By itself, this is a Turn 3 win with no need for Turn 1 acceleration (unlike the Heliod, Sun-Crowned combos, for example) and only requiring two cards that are each quite versatile, making it more compact and modular than any other creature combo in these colours