Rashmi, Eternities Crafter

Rashmi's ability triggers when you cast your first spell each turn, not just on your turn.

If the revealed card is a land card, you put it into your hand.

For spells with {X} in their mana costs, use the value chosen for X to determine the spell's mana value. For cards in your library with {X} in their mana costs, X is considered to be 0.

If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If Rashmi's ability resolves and the spell that caused it to trigger has been countered, use that spell's mana value as it last existed on the stack to determine whether or not you may cast the top card of your library.

Rashmi has to be on the battlefield at the moment you cast your first spell. If that spell is Rashmi itself, Rashmi's ability can't trigger. If that spell causes Rashmi to leave the battlefield as an additional cost to cast it, Rashmi's ability can't trigger.