Old Man of the Sea [Arabian Nights] Journey into Nyx Hero's Path Spend this mana only to

Spend this mana only to cast an Ally spell

Set: Legends Type: Artifact Creature — Shapeshifter Rare Cost: {4} {0}: Change Sentinel's base toughness to 1 plus the power of target creature blocking or blocked by Sentinel

They tunneled

where X is the number of time counters on As Foretold

Old Man of the Sea [Arabian Nights] Journey into Nyx Hero's Path Spend this mana only toSet: Arabian Nights Type: Creature Djinn Rare Cost: {1}{U}{U} You may choose not to untap Old Man of the Sea during your untap step. {T}: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power.