Unmarked Grave costs 1 more mana, is sorcery, and is restricted to nonlegendary cards (nice flavor btw), so it's not going into all Graveyard decks, but 2 mana tutor is still a great rate for decks looking to dredge up nonlegendary cards
Reducing Ojer Axonil's power before noncombat damage is dealt may cause its replacement effect not to apply to that damage
The same is true for expensive cards, you can get away with being a little more top heavy as you have ways to make use of those card when you can't simply cast them
0: Create two 2/2 black and green Wolf creature tokens with When this creature dies, put a loyalty counter on each Garruk you control. -3: Destroy target creature
These aren't just your standard booster packs
Knowledge gained from ancient tombs and dungeons will power Seferis within the White, Blue, and Black