Here's a quick rundown: Lavaspur Boots is especially good with The Mighty Thor, Jane Foster since we can use it to (somewhat) protect it, but more importantly give it haste to get its blink trigger right away
They require you to already have creatures with counters on them to work, but they can keep your snowball growing until you reach critical mass
Those kinds of boss monsters arent going anywhere, so neither is Ultimate Slayer until something stronger comes along
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The card is essentially the poster child for Modern Horizons power creep, pushing the envelope on what a one-drop can do off the deep end
It slows down decks that try to cast multiple spells in one turn like Storm, Tron, or Cascade, and it also messes with greedy mana production