If you play a Bane of Bala Ged, you can cascade into some big, nasty stuff
A rare nobody plays can be bulk, while a common that sees play in Commander, Pauper, Legacy, or Modern can be worth more than a handful of rares
But if you kick it for 2 more mana, you can exile one of your opponent's lands, making it perfect for those pesky Eldrazi Tron mirrors
Chapter II can add even more +1/+1 counters to The ThingThe Thing or another creature, that you can then double when The ThingThe Thing attacks if you pay the mana
PSA graders use a cards corners, surface, centering, and edges to determine the grade of a card
Since it requires a turn to go off, your opponents are going to focus their efforts on either enchantment removal or player removal, so you have to be ready to weather a storm of attacks and spells if players still have a lot of cards left in their hands