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At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.
Jul 25, 2025 · The value of X is calculated only once, as Ouroboroid’s ability resolves.
Jul 25, 2025 · If Ouroboroid leaves the battlefield before its ability resolves, use its power as it last existed on the battlefield to determine the value of X.
| Archetype | Format | Inclusion | Copies | Decks (n) |
|---|---|---|---|---|
| Selesnya Cub | Standard | 100% | 1–4× | 166 |
| Selesnya Ouroboroid | Standard | 100% | 2–4× | 28 |
| Mono Green Cub | Standard | 100% | 2–4× | 5 |
| Mono Green Ouroboroid | Standard | 100% | 4× | 3 |
| Golgari Graveyard | Standard | 100% | 2–4× | 2 |
| 4-Color Midrange | Modern | 100% | 2× | 1 |
| Bant Cub | Standard | 100% | 2× | 1 |
| Golgari Cub | Standard | 100% | 2× | 1 |