That first ability resembles the shenanigans you can get up to with Dargo, the Shipwrecker, so in the right deck, you can cast it for two mana, attack for seven (that can only be blocked by legendary creatures), and then sacrifice it to destroy an annoying artifact or creature
Add it to a deck, track its win rate, and see how it performs across your playgroup free
Sacrificing another artifact exiles cards from the top of your library equal to its mana value plus one, and you can play them that turn
Its definitely worth the time and effort this game is incredibly fun, and the community is wonderful as well
You can obtain the Leafeon ex (2-Star Shiny rarity) card by opening Wisdom of Sea and Sky: Ho-Oh from Wisdom of Sea and Sky set
You may need to use an online card directory to determine each cards position in a set