Called the pity timer, every time you dont get a wildcard of any rarity when opening a pack, the drop rates for that rarity will increase
In an aggro deck, you wont find many cards with a high mana cost, and as a result, most cards wont be super powerful or game-changing on their own
But we know how broken Memory Jar was, so a Standard legal one with this many breaks may not be great for Standard, but it will be amazing as another addition to artifact matters or cool card flow
If you have more than two instants or sorceries in your graveyard when this resolves, you get added to your mana pool, making this essentially a Demonic Tutor
Free lands are good
However, I strongly feel the card is pretty good and probably will see play in the future