If, among the 5 mythic lands, Wizards prints just ONE good card, it's going to be in all of the decks that run that color
It would be beneficial to build your decks around these cards, facilitating the high-energy attacks that they possess
Emergeroid Call X TRAP Counter When a Spell/Trap Card, or monster effect, is activated while you control a "roid" Fusion Monster: Negate the activation, then send all cards with the same name as that card from the activating player's Deck and Extra Deck to the GY
This doesn't mean the game won't expand on each color combination's identity in future sets, as MTG has done in over 30 years, but Archazia's Island may not move the needle in terms of meta decks if it doesn't create new color identities
SR Super Rare Emissary of the Afterlife X DARK Level 4 [ FiendEffect ] ATK 1600 DEF 600 When this card is sent from the field to the Graveyard: Each player adds 1 Level 3 or lower Normal Monster from their Deck to their hand
Dont be afraid of the card disadvantage