This makes it a pretty bad idea to keep Counterbalances, and bringing in Rest in Peace is not worth it, as its a double-sided Tormods Crypt, which is not what you want to be doing
The First Sliver gives all your other Slivers cascade, so you can cast two every turn
Depending on context, these cards may be called prison pieces, hate cards/hatebears, sideboard cards, or, in some circles, stax cards after the ancient Smokestack-based deck which popularized not letting the other person play as a strategic archetype
Just remember not to actually crew your Druid-mobile at any point, lest it instantly collapse under the weight of its trillion -1/-1 counters
Card draw is another reward, often connected to paying mana, like with Shanna, Purifying Blade, Well of Lost Dreams, or Dawn of Hope
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