(It is every creature type.) Enchantment Ramp (CTRL to add secondary) removal removal (CTRL to add secondary) wheel Day's Undoing Each player shuffles their hand and graveyard into their library, then draws seven cards
Bile Blight is the other way around)
The result: a ton of valuable versions of many cards exist, even if they're not the base, primary printing
Since both your win and loss conditions are shared, its totally viable for one or more players to forgo advancing a game plan and play a pure spoiler role, particularly with counterspells or prison effects
If an effect causes you to discard a card, discard it, but you may put it on top of your library instead of into your graveyard
You can only sacrifice the permanents that you control