meadow downstream cards and sleeves pack Rebel Centrum | Meadow: & there is an R envelope with 6 cards as a mini Meadow: Downstream Expansion Board Game

A fitting mon for the top spot on this list.

Simic Sky Swallower / Sagu Mauler You can't win the game without dropping someone's life down to 0, unless you have a funky win-con or milling thing going on, but not generally

And others use the oil counters like the fading mechanic so the card comes with counters but you need to take one off every turn, like Evolved Spinoderm

See rule 701.25, Surveil. 701.25a: To surveil N means to look at the top N cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order

But this card in particular caught my eye because of its gorgeous use of color