The creatures in the Challenger Deck are mostly on point, minus a couple of extra copies of Murderous Rider and Lovestruck Beast, while the main expense is improving the mana base with a playset of Overgrown Tomb (which thankfully is one of the cheaper shock lands, at only $46 for all four copies)
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However, if a single creature you control with lifelink deals combat damage to multiple permanents and/or players at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will apply only once
Theres a long, storied history behind the reserved list which includes potential legal repercussions if Wizards were to ever abolish the list and reprint the cards anyway
Each of them has their own respective criteria for their grading scales as well as their own qualities which may appeal to certain collectors
it only stops when your opponent kills Brutal Cathar