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Then if creatures you control have total toughness 20 or greater, untap each creature you control

Creature - Sphinx Draw (CTRL to add secondary) Enchantment Magmatic Core Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) At the beginning of your end step, this enchantment deals X damage divided as you choose among any number of target creatures, where X is the number of age counters on it

Sometimes it's a mechanical connection, sometimes it's more to do with the story, and sometimes it's to do with the development of the set