Scavenger Regent // Exude Toxin
The interesting wrinkle sits on the back side, and it is the opposite of what it looks like: Exude Toxin shuffles itself into your library rather than falling to the graveyard, so casting the sweep does not permanently spend the card. It goes back into the deck to be drawn and cast again, which means over a long game a single copy can wrath the board more than once. The trade the card actually asks about is timing and tempo: fire the reset and you lose the 4/4 flier from your hand for now; hold the beater and the sweep arrives later, if the shuffle puts it back in reach. The asymmetry on the sweep runs along a tribal line rather than an evasion one. Each non-Dragon creature shrinks by X until end of turn, so your Dragons walk away untouched while a wide non-Dragon board collapses; a grounded Dragon survives and an opposing flier does not, because the filter is creature type, not the sky. Build a top-heavy Dragon shell and a symmetrical-looking board wipe resolves as a one-sided one. The front half is no fragile combo piece: Ward that taxes a discarded card makes the flier awkward to remove, so it stands on its own as pressure. Every time you draw the card, the board tells you which of the two halves you are actually holding, and the reshuffle governs the pace at which the other half comes back around.
