Generally speaking, the higher a monster's Level is, the more resources will be required to Summon the monster
You can now import it in the MTG Arena client
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The ability to pay mana and ping each opponent isn't incredibly powerful, but it is a way to keep things rolling in decks such as Rakdos, Lord of Riots or the more recent Ob Nixilis, Captive Kingpin without having to have spells or other nonland permanents around to help generate life loss
Throughout the series, Onix has been a recurring sight, appearing in games like Pokmon Gold and Silver, where players could evolve it into Steelix using a Metal Coat, thereby increasing its strategic versatility
I dont think its worth the price of admission