Currently both UG and UB are looking to use canisters. I figured we could distinguish those by trying to encourage Green canisters to untap lands and Black canisters to untap non-lands. So I am looking for a common tap ability that feels stronger if you can activate it twice in a turn. In this case it is stronger because you don't have to double pay the "cost" of setting up the condition that lets you activate it. Does this feel common? Is there a better common, repeatable, ability that you would spend a canister to use an extra time?

T: Put a counter on me

Whenever I become untapped, +1/+1 UEOT

Possible uncommon

Or possibly just a counter each time

Black Green is supposed to care about Sacrifice triggers, which obviously canisters can help with. While Blue/Green is the more direct ramp/tap effects color.

Unless you have a better idea for UB, that archetype just says canisters. That is why I am making a card for the UB deck that uses canisters, and why I am suggesting a possible way to make UB feel different from UG while still using many of the same Blue cards.

Well, the archetype is still undecided, actually. It could be Canisters, but we're not sure.

I do like the idea you propose, though, Jackal. is canister ramp, while is canister on permanents. The problem is... black doesn't get any canisters. So it makes it very difficult to make a canister archetype.

Can Black get canisters? Or did we decide that only colors that can "Untap target creature" get canisters?