This is actually a significant buff, because now you can do things like spend three stones and three AP (remember, he treats Glowy tokens as, effectively, Fast tokens) to throw three Stuffed Piglets, inflicting 6 AOE damage in the form of six individual pulses of 1 (i.e
Aura of Silence [Best Tax and Removal Enchantment in White] Aura of Silence makes life miserable for artifact and enchantment decks
Opponents can lose life based on how many auras including Phyresis are on the field with a Eriette of the Charmed Apple Commander deck
While both mechanics give players poison counters equal to their N value, toxic is a static ability (doesn't go on the stack) while poisonous is a triggered ability (it does go onto the stack)
In a format like Explorer or Historic that doesn't have the literal The Rack, the backside could be a replacement, although I'm not sure how a discard deck is going to flip the battle
The ranges take into account the card's condition, from decent condition (PSA 5-6) up to perfect condition (PSA 10)