Crystalline Sliver Crystalline Sliver allows Sliver players to play their game without being paranoid (or at least, while being less paranoid) that disaster will strike them at any time
Broken blue card draw spells come and go, but its not every day a counterspell gets printed that is legit better than actual Counterspell
Given that Lady Tremaine, Imperious Queen can be Shifted onto another Lady Tremaine card - such as The First Chapters Lady Tremaine, Wicked Stepmother - for just four ink, in the right deck she can be a cost-effective way of wiping the table of threats or leaving your opponents floundering without needing to directly challenge them
Robot or human
For example, the Excess side of Indulge // Excess costs 2 mana to cast while the Cooperate side of Refuse // Cooperate costs 3 mana
If a player makes any tokens, then Anointed Procession will double it, which will flood the battlefield in a hurry