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This is also great against land removal for you or others as your stuff dies you can still tap for it, so if your foe uses Vindicate to destroy your Cabal Coffers when you control Urborg you can just tap this to make that mana

Once your Vault hits 100%, you can open it to get more wildcards

The idea is to get the most bang for your buck so you can reinvest those new found dollars into MORE cards, right

Other effects that interact with putting counters onto that creature will interact with this effect accordingly

For example, Amber is meant to be a support Ink type, whereas Amethyst is meant to be more fragile ability users

Against control, you might bring in Ozai's Cruelty or Roiling Vortex to prevent lifegain and punish free spells