Unfortunately, because of this, its best for me not to get too attached because the card, or even the whole deck, may change very quickly due to a number of reasons, including maintaining balance.
To prepare against Thoughtseize, Modern decks need to bring a certain level of resiliency and redundancy to the battlefield
Invasion of Mercadia C-Tier: Basically the battle version of Bitter Reunion, except the ability to give all of your creatures haste is likely more of an upside than potentially flipping into a 3/3, which means this is probably just a worse version of a card that already exists
9 Dungeon Master Dungeon Master is a Planeswalker for four mana that revolves around rolling dice and creating an "adventuring party" in the form of fitting creature tokens such as a Rogue with hexproof and a Fighter with first strike
Then when they arrive they are Shocked and then grow two power if a Dino like them
If no one does, target player mills six cards