Try combining Eshki with high-power evoke or warp creatures like Spitebellows or Anticausal Vestige
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
For example, you can't sacrifice a Clue token to activate its own ability and also to activate Alquist Proft, Master Sleuth's ability
As ever, Enchantments are value monsters, and between their presence on the board and the synergies they can have when playing, there is a lot of that value to be had
While this can technically wait until later in the process, the earlier you start the easier it will be overall
Mana rocks that are now mine, for one turn