Maestros' Totally Safe Hideout is a rare Land card from Mystery Booster 2 (MB2), collector number 615. Current market price: $0.24, TCGplayer market prices via Scryfall.
Land casualty 2 (As this land enters, you may sacrifice a creature with power 2 or greater. If you do, create a token that's a copy of this land.) Maestros' Totally Safe Hideout enters the battlefield tapped. {T}: Add {U}, {B}, or {R}.