Thran Golem

The whole card is a conditional: pay five mana for a vanilla 3/3, then spend a second card and a second turn enchanting it before it becomes the 5/5 flyer with first strike and trample the name implies. That two-card setup is the friction the rate is built around, and it cuts against the grain of how Aura decks actually want to operate. Auras are already a tempo liability, since you risk getting two-for-oned the instant the host dies, and stacking that risk onto a five-mana body that arrives inert until the second piece lands is a steep ask. The payoff is real (a 5/5 evasive trampling first striker shrugs off most ground blockers), but the sequencing leaves a wide window where you have committed mana and gotten back a body that trades down. The wrinkle worth noting is that "enchanted" cares only about whether an Aura is attached, not whose Aura it is: an opponent's pacifying enchantment still trips the switch, which means a hostile Aura can hand you the upside it was meant to deny. It is a creature that asks to be the second half of a plan rather than the first, and most decks would rather have the flyer up front.