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You cannot Special Summon monsters the turn you activate this effect, except Wyrm-Type monsters

That being said, I don't have that same luxury with the more obscure decks so generally speaking, unless there's a lore specific reason of limiting cards to certain quantities due to their uniqueness (for example only 1 copy of each Crystal Beast existing), 2 or 3 copies are acceptable in order to preserve the feeling of the deck as it appeared in the anime

Let Mega Altaria ex absorb pressure first, then transition into controlled attacks once your board is stable

Outside of those you have oldies that play like rock stars in Phytotitan