Laboratory Maniac We all know that milling is a great way to get rid of opponents
The real fun is finding ways to make them shine as a natural part of your deck or to exploit them in niche metas where they hit hardest
All cards printed with the changeling ability are shapeshifters but there are lots of shapeshifters that arent changelings, like Aetherling and Altered Ego
Ugin's Binding is nuts, especially if youre doing some self-mill, even if youre just using some of the 100ish colorless artifacts that cost 7+
For each player, choose a creature or planeswalker card in that player's graveyard
While cards with abilities similar to this had existed, the fact that this card was designed to boost your creatures and weaken your foes, as long as they were playing nonblack, was rather novel for the time