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One card giving you the option of a second copy of your best creature late in the game versus a land early is absurd enough that this often makes the cut in my blue deck regardless of whether my strategy cares about clones

Example: This is one reason Grixis Deaths Shadow is so great: you can use your mana on Turn 1 to Inquisition of Kozilek and then Serum Visions on Turn 2

Also, you can pay two mana and tap them to double the number of each counter on an Artifact, Creature, or Land

Attacking an opponent with a 30/30 legendary creature possessing trample, double strike, and lifelink is not unusual in a Commander game with Dogmeat, Ever Loyal