Even if this dies, its often a four-for-one, forcing each opponent to discard a card on top of somebody using removal on it
6 Aquapolis (2003) $33,480 + An E-Card Era Gem Aquapolis boxes are rarely seen on the market, and some estimates place their value in the range of $30,000
Make sure to keep your MTG proxy cards away from any potential sources of mess or spills
Out: In: Force of Negation is going to trade for a card every time, but its going to be a little bit inefficient and the second copy in a game can be a liability
With so many cheap artifacts, we will often have at least 3 out by the time Urza is played, and with the construct, we can have basically 4 new mana, making Urza free
Then, whenever an opponent discards a card, you get to create a 1/1 Elf Warrior token