There was a profound shortage of didactic and specific deck building content in Commander
Abundant Countryside Belonging Birthing Boughs Black Market Connections Crib Swap Formless Genesis Irregular Cohort Littjara Maskwood Nexus Personify Sliver Queen Avatar Stalactite Dagger The Bears of Littjara
The main card that represents this is Counterspell, the original Alpha counter, capable of countering all sorts of spells and responsible for making players become suspicious of two untapped islands
Blood tokens are, at first glance, good for getting rid of excess lands or digging for that card you need to squeeze out of a tight spot
A game specifically about card advantage is one example, which it can be especially if Force of Will is a factor, but this tends to come up in spots where being green is a real cost
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