Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $0.35 at Card Kingdom, near mint, their price list as of .
Gate Colossus 
Artifact Creature — Construct · 8/8 · Uncommon · Foundations · #675
Affinity for Gates (This spell costs {1} less to cast for each Gate you control.)
This creature can't be blocked by creatures with power 2 or less.
Whenever a Gate you control enters, you may put this card from your graveyard on top of your library.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
5 printings · $0.35 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 315 | Uncommon | $0.35 | $0.49 |
| Foundations | 675 | Uncommon | $0.35 | — |
| Ravnica Allegiance Promos | 232 | Uncommon | — | $0.59 |
| Ravnica Allegiance | 232 | Uncommon | $0.35 | $0.49 |
| Ravnica Remastered | 257 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 8 November 2024Once a creature with power 3 or greater has blocked Gate Colossus, changing the power of the blocking creature won't cause Gate Colossus to become unblocked.
- 8 November 2024To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.