With a reasonably low Ink cost of 4 (and no option to use it in your Inkwell, as is the case with several cards on this list!), its easy enough to get Robin Hood into play
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Whenever you cast a black spell, put a +1/+1 counter on Emet-Selch
Whenever Sin enters or attacks, you must " exile a permanent out of your graveyard at random, then create a tapped token copy of that card
Any choices made on resolution, such as whether to put counters on a permanent, are also made individually.
At the very least, many common cards can be used as ink , but they can also be used to shift stronger cards and support them