They do nothing on their own, so only run them once your source-and-payoff core is solid
It' cheap to acquire, cheap to play, and can be snuck down past a counter-shield
X spells and activated abilities of creatures or other spells that draw you more than one card are usually the most effective
Getting back fetch lands is always nice, but there are plenty of other lands that send themselves to the graveyard for value, like Strip Mine, Wasteland, and the aforementioned channel lands
[P][C] Peck: 20 damage
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