(2004-10-04) Abeyance never prevents mana abilities from being activated
Mostly, Urza is a problem when built around a stax artifacts deck running cards like Winter Orb and Static Orb
While there were several competing styles of Survival decks around the time of its banning, the one that really ignited the controversy was Calebs Vengevine/Survival deck that would quickly put all its Vengevines into the graveyard, then play a couple of Basking Rootwallas for free, leading to extremely backbreaking assaults (frequently in the air, thanks to Wonder) that were immune to most forms of interaction
Once youre above that 10k threshold, you can drop an Aetherflux Reservoir
Paired with another token generator like Tana, the Bloodsower, Tevesh Szat is a value engine and a win condition in one
While Exclude is a fine card I find in building I would always prefer to run a mix of pure filler in the form of card quality and more precise and efficient answers