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Our Hierarchical Drawing Pools architecture enables game developers to freely customize pool probabilities for each use case according to their game design while maintaining constant and fair pull rates using on-chain random variables generator such as opBNB VRF service, as a verifiable source of randomness to address any fairness concerns. The smart contract’s multi-layer design also allows for unlimited minting of common utility cards as well as launching rebalances and expansions without affecting the overall pull rates.