You could do something as simple as adding an extra -1/-1 counter to an enemy creature, or you could really ruin someone's day by doling out poison counters at an alarming rate
Discard Miscellaneousaurus
Im not sure this is great, but I put it in the Top 5 because its restrictions will no doubt breed some creativity
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Nordics' endboard on its own is not enough to contend with the meta and you'll have to play them with other archetypes: Without them, if Gullveig cannot banish only Alviss you'll already be at a card disadvantage
Thalia, Guardian of Thraben Speaking of white soldiers, Thalia, Guardian of Thraben is a classic white weenie card that makes for a fine disruptive piece