There are a few permanents that offer more doubling up of counters, as well as ones that save counters from removed creatures, but even without these, Counter Blitz is very powerful right out of the box
Discard an Inkable card from your hand, and you can play this card from your discard pile for free
If you have 4 items in play, you can exert all of them to slam down Scrooge McDuck Resourceful Miser, developing a 4|4 Character without needing to use Ink
Culling Ritual can turn things like tokens and utility pieces into mana, but it wont kill anything with mana value 3 or greater
The cost reduction applies only to generic mana in the total cost of noncreature spells you cast
Unfortunately, the small print smothers a lot of the enthusiasm for this promotion in advance