Unstable Obelisk $0.50 Ive run Spine of Ish-Sah in many decks, especially artifact-based strategies, so Im no stranger to paying way too much mana to destroy something
If you wanna spend further though
It's highly unlikely that any of the newly released cards bearing original artwork and a tiny golden arches logo will come anywhere near that value, but offers currently on eBay include a set of 50 sealed packs for nearly $1,000, with 25 already sold, and individual cards like Pikachu falling in the $20-40 range
(Create a token thats a copy of a creature token you control.) Mat'Selesnya sings out, and life flourishes in answer. Illustrated by Torstein Nordstrand Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
The combo is very easy to compile all the parts together, allowing for potential infinite burn damage to close out any game