100 pokemon cards gx and ex TCG : CARD LOT RARE, COMMON, UNC, HOLO & GUARANTEED OR FULL ART – PoketMonsters Buy Now! Pokemon Card Game/[MC] Starter Deck

In a deck focused around challenging characters, removing the option for your opponents to keep their characters ready is quite powerful

If your deck relies on your Commander, this can be backbreaking

Card Set(s) -Memorial Collection- [EB-01] CARD VIEW EB01-030 | C | STAGE Loguetown Block Icon 2 Effect [Activate: Main] You may place this card and 1 card from your hand at the bottom of your deck in any order: Draw 2 cards

Other design teams have expressed interest in using them

Just watch out for Quicksilver Fountain's second ability, which will remove all flood counters from all lands in play if each land in play has become an island.