Sheoldred is the perfect finisher for this type of deck
Swinging out is the easiest way, but you can also drain your opponents' life with cards like Ayara, First of Locthwain, Valley Rotcaller, and Mirkwood Bats or sacrifice your Rats to kill the table with a Blood Artist, Zulaport Cutthroat, or Syr Konrad, the Grim
It doesn't matter whether a Giant, Wizard, or spell you control deals the excess damage, only that excess damage was dealt and that one of those three things dealt damage to the creature or planeswalker at some point during the turn
For some reason, Untamed Wilds was an uncommon, while Nature's Lore was quickly moved into common after initial uncommon rarity
Over the years, the regular version has made it to $40 at least once, because its just one of the best things you can do in blue
Buy Deck Protectors: MTG- Duskmourn- Valgavoth, Harrower of Souls for only $13.50 at The Fourth Place