It provides such power and consistency to these decks, almost always storm deck variants, that its caught bans in Pauper and Legacy
Abomination of Llanowar Animate Graveyard Apocalypse Demon Bloodsworn Knight Boneyard Mycodrax Boneyard Wurm Candlekeep Inspiration Consuming Aberration Consuming Blob Elephant Resurgence Graveyard Busybody Leonardo da Vinci Lumra, Bellow of the Woods Melek, Reforged Researcher Nethergoyf Old Stickfingers Revenant Seize the Storm Sewer Nemesis Souls of the Lost Splinterfright Sutured Ghoul Svogthos, the Restless Tomb Textbook Tabulator The Capitoline Triad Titania, Gaea Incarnate Umbra Stalker Unlicensed Hearse Urborg Lhurgoyf Wrenn and Seven
8-9: Extremely good cards, usually game-winning bombs and the most efficient removal spells, though not quite good enough to be a 10/10
Here's one: randomly pick a card in a new set and see if you can understand why that card was put into the set
His is a Cleric tribal deck which, once it gets rolling, is really resilient
The bolster ability triggers off any of your dragons attacking, so you can stack up counters fast, even if they dont always go where you want them to