what does the world card do in binding of isaac

what does the world card do in binding of isaac Game: Mystery, Strategy, and Excitement! Everything The Binding of Isaac:

Name: what does the world card do in binding of isaac Game: Mystery, Strategy, and Excitement! Everything The Binding of Isaac:
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Description

They were sold as separate cards that formed a combined card when placed together

Elesh Norn's first ability doesn't copy the triggered ability

Though Leos got 3,200 ATK, there are too many ways to get rid of this card for it to be very practicalparticularly since the player can have NO spells or traps in the spell/trap card zone to use the effect