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At the same time, if they choose to let you drop a creature, you need to have one in your hand to drop

Instant Swiftfoot Boots Equipped creature has hexproof and haste

All you need to do is flood your board with plenty of creatures with one toughness, and suddenly you can pay one mana to draw two cards as often as you want

The effects that "pair" them imply that each pair is composed of biological sisters, while the names of the Xyz forms and general appearance of the Main Deck forms imply they're nuns (Irene in particular, who appears to be wearing a coif, part of the traditional religious habit of nuns)

Set and era

I'm keen to see how this card plays out across all formats