Sometimes I'll pay more after looking at the collection, especially if a majority of the cards are from Mirrodin block or before, or if the seller seems to be the type to leave Remands and Serum Visions in their bulk boxes
They each cost three, have 6 total power and toughness in 4s and 2s, they have one keyword and a tap ability that doesn't cost anything to use like mana or discards to drop your cost of their colors' spells by colorless at sorcery speed by either life lost or gained this turn
Depending on the circumstances, thats effectively a boardwipe
Also, adding a stand will make it firmer
Untapping and retapping an artifact is the easiest thing in the world, which will surely inspire some intrepid brewers to find ways to blow the entire table away in weather domination
Extra Deck Monsters But, what should you be Fusion Summoning