Cheapest priced copy (Jumpstart): $0.99 at Card Kingdom, near mint, their price list as of .
Towering Titan 
Creature — Giant · 0/0 · Mythic · Tarkir: Dragonstorm Commander · #276
This creature enters with X +1/+1 counters on it, where X is the total toughness of other creatures you control.
Sacrifice a creature with defender: All creatures gain trample until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 31 | Mythic | $0.99 | — |
| Tarkir: Dragonstorm Commander | 276 | Mythic | $0.99 | — |
2 rulings from Wizards of the Coast
- 23 June 2020If another creature is entering the battlefield at the same time as Towering Titan, its toughness won’t contribute to the +1/+1 counters on Towering Titan.
- 23 June 2020Once Towering Titan has entered the battlefield, it doesn’t gain or lose counters as the total toughness of other creatures you control changes.