Build a base that lets each search reach the colors you genuinely need
Rikku makes creatures unblockable and can move a counter from an opponents creature to one of your creatures
Some spells have text that allows you to choose the same mode more than once
Maybe you force your opponents to keep attacking each other or force them to use their Planeswalker's most powerful abilities on themselves
The most hyperbolic example is Atraxa, Grand Unifier

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