Just imagine this in something something Dragon Rulers: Pay 2k Life Points, get a 5k beater (a lot of pressure if you have the Lances and anti-effect cards to back it up), and any DRoolers still in your Deck are now in the Graveyard so that next turn you can start slinging them out and getting your Dracossacks and Big Eyes out onto the field
(For example, consider Vikavolt V, which was out of the spotlight for a long time before finally becoming playable again due to shifts in the metagame.) Finally, note that this is my top ten, so there will be some subjectivity involved
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It can also be used as a political tool to move detrimental counters from your opponents' creatures
Two damage for three mana isnt a good rate, but it is colorless, which matters and casting those big eldrazi was par for the course