mtg play test cards Zyym, Mesmeric Lord [Mystery Booster Playtest Cards] (This happens each time a spell you control or an ability of a permanent you control causes an opponent to pay extra mana Mystery Booster 2 Release Notes

For two mana we get to look at two cards, which is a great rate

You can also win by milling your opponents deck so they are unable to draw a card on their turn, which is a goal for Dimir, or you can hit a certain life total that triggers victory due to a card abilitylike Angel of Destiny, which is featured in white decks

Once again, there is something of a split between themes, though thankfully nothing in this year is as divergent as Call the Spirits

If they are holding removal or countermagic you can take that away, see what other options they have and then do your own thing with perfect information and safety

This is a solid effect in some decks, but so far its been a niche piece in the grander scheme of Magic