Starting with Throne of Eldraine , regular boosters were rebranded as draft boosters, to distinguish them from theme boosters and collector boosters
Largely unrelated to the rarity of a specific card (although the two can go hand-in-hand), these Pokmon card types instead represent different versions of Pokmon in the games world - from their basic starting forms to later evolutionary stages and even immensely powerful Mega Evolutions and other variants
I find that, typically, when you are about to off an Oblivion Stone or a Nevinyrral's Disk effect, at least one other player wants it
For spending cash : Run to the MTGA store or Gray Viking Games and spend, spend, spend to your hearts content
Since the tribute is also not an activated effect, there is no way to stop it unless your opponent has a card that stops you from Summoning monsters in general