MScore: 6.7/10
Treasure Keeper
Artifact Creature — Constructuncommon
When this creature 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.
3/3
Illustrated by James Paick · Aether Revolt · #177
Rulings for Treasure Keeper
5
2020-08-07
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.
2020-08-07
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.
2020-08-07
If a card in a player's library has {X} in its mana cost, X is considered to be 0.
2020-08-07
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.
2020-08-07
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.
: Add 
. When you next cast a spell this turn, exile cards from the top of your library until you exile an instant or sorcery card with lesser mana value. Until end of turn, you may cast that card without paying its mana cost. Put each other card exiled this way on the bottom of your library in a random order.
, 
(an energy counter).