Cheapest priced copy (The Big Score): $0.99 at Card Kingdom, near mint, their price list as of .
Collector's Cage 
Artifact · Mythic · The Big Score Promos · #1p
Hideaway 5 (When this artifact enters, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)
{1}, {T}: Put a +1/+1 counter on target creature you control. Then if you control three or more creatures with different powers, you may play the exiled card without paying its mana cost.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.99 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Big Score | 1 | Mythic | $0.99 | $1.99 |
| The Big Score | 31 | Mythic | $5.99 | $10.99 |
| The Big Score | 66 | Mythic | $4.99 | $4.49 |
| The Big Score Promos | 1p | Mythic | $1.29 | $1.99 |
7 rulings from Wizards of the Coast
- 12 April 2024Hideaway now causes you to put the rest of the cards on the bottom of your library in a random order instead of any order.
- 12 April 2024If the spell you cast has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
- 12 April 2024Previously, permanents with hideaway entered the battlefield tapped. This ability has been removed from the definition of hideaway. Older cards have received errata to have an additional paragraph that reads "[This permanent] enters the battlefield tapped," and they now have hideaway 4.
- 12 April 2024Collector's Cage's last ability looks at the creatures you control as it resolves to determine if you can play the exiled card. For example, if you control a 4/5 creature, a 1/1 creature, and a 2/1 creature, there are three different powers among creatures you control.
- 12 April 2024If 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, such as kicker costs. If the spell has any mandatory additional costs, those must be paid to cast the spell.
- 12 April 2024Any player who has controlled a permanent with a hideaway ability since a card was exiled with it may look at that card.
- 12 April 2024You choose whether to play the exiled card as Collector's Cage's last ability resolves. If you do, you do so as part of the resolution of that ability. You can't wait to play it later in the turn. Timing restrictions based on the card's types are ignored. However, you can never play lands on other players' turns.