Their flexibility and synergy make them staples across the format
This meant that in any Burn mirrors, where life total preservation was paramount, that the Stomping Grounds was a huge liability
Now you can steal the Sol Ring that you got from Steve, use's it's mana, and then give it to Jamie permanently
As weve seen with Sneaky Snacker, its trivial for decks like Faeries and Grixis Affinity to draw a lot of cards in one turn
It does need that first poison counter on your opponent before the proliferation plan starts working
Countermagic : Mystic Snake, Frilled Mystic, Draining Whelk Reanimation : Karmic Guide, Phyrexian Delver, Extraction Specialist Milling : Manic Scribe, Thieves' Guild Enforcer, Sage's Row Denizen Self-Milling : Stitcher's Supplier, Satyr Wayfinder, Balustrade Spy Discard : Burglar Rat, Mesmeric Fiend, Sin Collector Goading : Insufferable Balladeer, Jeering Homunculus, Vengeful Ancestor "Gain Control" effects : Hostage Taker, Agent of Treachery, Gonti, Lord of Luxury Clones : virtually all of them, though a few are decently pricey