Stain the Mind is a hate card against any deck that's reliant on a single card, and Tormod's Crypt is an iconic hate card against any deck trying to take advantage of the graveyard
If I choose the word "side," does my opponent take 2 damage for saying the word "sidewalk"
White has a giant selection of cards that can accomplish boosting up power at instant speed, which allows you to pump Glen after your opponent's declared their flimsy small blockers (or none at all), but before the damage actually goes through
You cant do much better than unconditional destruction at instant speed for a single mana
It is a constructed format, so you build a 60-card deck and in Best of Three matches, you also use a sideboard
A Reaper King Commander deck is pretty much all scarecrows, shapeshifters, and artifact/artifact creature payoffs