Theyre small and mostly weak, but they get strong with numbers
The idea here is to have a control shell with a lot of counterspells, some removal spells, and good value creatures to stabilize
Whenever Grimgrin attacks, destroy target creature defending player controls, then put a +1/+1 counter on Grimgrin
Wan Shi Tong, Librarian's Value in MTG $134.54 for a Borderless foil version $82.02 for Borderless non-foil $49.66 for regular non-foil
Together, these cards help to shift the tempo of a game by letting you move proactively while you still hold up interaction, an invaluable trait in such a fast and reactive format
Any damage dealt to a battle causes that many defense counters to be removed from it