Dungeon of Silo's Secrets

Level Up: {t}: Put a -1/-1 counter on a creature you control for each counter on Dungeon of Silo's Secrets.
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Level 1 - 3 Creatures you control get +X/+X where X
| is the number of counters on this.
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Level 4 - 6 At the beginning of your upkeep create X
| Treasure tokens.
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Level 7+ {3