Arnjlot's Ascent (ICE)

Enchantment

Cumulative upkeep {U} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) {1}: Target creature gains flying until end of turn.

Niche tempo tool for blue control decks, but cumulative upkeep makes it a poor long-term investment compared to instant-speed flying grants like Slip Through Space or permanent evasion sources like Wonder. The mana cost balloons quickly, and by turn 4–5 you're paying {U}{U}{U}+ just to keep it in play—a steep price for a one-shot effect that doesn't impact the board.

Ice Age — Common