mtg card storage boxes It can also improve its strength and durability for a longer lifespan The Spell Box | BBB

We've got loads of tokens to make that happen, note its worded to work once per combat

Whenever Assimilation Aegis becomes attached to a creature, for as long as Assimilation Aegis remains attached to it, that creature becomes a copy of a creature card exiled with Assimilation Aegis

the fact that this tutors for those restricted artifacts means Urza's Saga is restricted in Vintage as well

Usually I prefer combat tricks like these to be any target and not just creatures you control, such as cards like Rogues Passage potentially weaponizing creatures your opponents control

Any power- or toughness-setting effects that start to apply after Timber Paladin enters the battlefield will overwrite these effects, regardless of when Timber Paladin became enchanted by one, two, or three or more Auras