When Treasure Keeper dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order.
2XM · EN 1a7be0a2-d8ac-45c7-b0a0-eb0886f47b5f2020-08-07
If a card in a player's library has {X} in its mana cost, X is considered to be 0.
07-08-2020
wotc
If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
07-08-2020
wotc
If you don't cast the nonland card with mana value 3 or less, it'll be put on the bottom of your library in a random order with the other cards.
07-08-2020
wotc
If your library has no nonland cards in it with mana value 3 or less, you'll reveal all the cards in your library, then put them back in a random order.
07-08-2020
wotc
If you cast a spell "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.