Cheapest priced copy (Secret Lair Drop): $44.99 at Card Kingdom, near mint, their price list as of .
Blightsteel Colossus 
Artifact Creature — Phyrexian Golem · 11/11 · Mythic · Mirrodin Besieged · #99
Trample, infect, indestructible
If Blightsteel Colossus would be put into a graveyard from anywhere, reveal Blightsteel Colossus and shuffle it into its owner's library instead.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
5 printings · $44.99 to $199.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 235 | Mythic | $57.99 | $79.99 |
| Double Masters | 357 | Mythic | $99.99Out of stock | $109.99 |
| Mirrodin Besieged | 99 | Mythic | $59.99 | $199.99 |
| The List | 2XM-235 | Mythic | $54.99 | — |
| Secret Lair Drop (FAS-BOR7 Horus) | 2223 | Mythic | $44.99 | $47.99 |
4 rulings from Wizards of the Coast
- 7 August 2020Damage from a source with infect is damage in all respects. If the source with infect also has lifelink, damage dealt by that source also causes its controller to gain that much life. Damage from a source with infect can be prevented or redirected. Abilities that trigger on damage being dealt will trigger if a source with infect deals damage, if appropriate.
- 7 August 2020Damage that a creature with infect deals doesn't result in damage being marked on a creature or a player losing life. Instead, it results in that many -1/-1 counters being put on that creature or that many poison counters being given to that player. Damage dealt to planeswalkers still results in that planeswalker losing that many loyalty counters.
- 7 August 2020The -1/-1 counters remain on the creature indefinitely. They're not removed if the creature regenerates or the turn ends.
- 7 August 2020A player who has ten or more poison counters loses the game. This is a state-based action.