Sacrificing an artifact after Furtive Courier has been blocked won't cause it to become unblocked
That didn't stop Cloak from being the common most likely to bring joy to little kids beating down with their enhanced creatures, but we will never know how much play this card might have had if the standard green mana curves of the time hadn't included token generators and untargetables
1: Day of Black Sun [[Day of Black Sun]] is my first pick and for good reason
Tier 1.5: StarCityGames Art Sleeves, Dex Protection Hyper Mat, KMC Card Barrier Mat Tier 2: BCW Double Matte, Ultra Pro Art, Ultra Pro Solid Color, Ultra Pro Double Matte, Channel Fireball , Max Protection Art, Ultimate Guard Supreme, Ultimate Guard Supreme Matte, Legion , KMC Card Barrier (non-matte), KMC Card Barrier Art Sleeves, StarCityGames Double Matte
By mid-game your whole board has every keyword imaginable and Hivelord makes them immune to removal
Skullclamp's actual value as an equipment is negligible