Blessed Hippogriff // Tyr's Blessing

Tyr's Blessing is the half that earns the slot: a one-mana instant granting indestructible to any creature, which puts it in the same timing window as a board wipe, a targeted removal spell, or a losing block. Cast it in response, keep your threat alive, and the Hippogriff still waits in exile to be cast later. That two-stage structure lets a single card blank a sweeper on turn four and then commit a flier on turn five, with neither half ever stranded in hand as a dead draw. The creature is the lesser piece of the bargain. As a 2/3 flier whose attack trigger hands flying to a different attacker rather than to itself, it wants a board of ground-pounders behind it, converting an evasion-poor attack into one that slips past a clogged defense. The Adventure framing solves an old problem with white's protection spells: instant-speed indestructible has always risked becoming a card-negative blank once the threat resolves safely, so binding the answer to a creature that returns later means the flexible save banks a body instead of costing tempo. You buy the protection now and collect the flier on your own schedule.