Verdeloth the Ancient also suffers from a kicker ability with an X cost
If your reanimation target isnt essentially paying for itself the moment it touches the battlefield, then it should either be individually hard to kill, feature some extremely potent reward for keeping it around, or both
First up, he's indestructible, letting you attack with him with impunity
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Beyond that go for faster lands Sanctum of Ugin, Ancient Tomb, Eye of Ugin, better ramp Mana Crypt, The One Ring for draw, the Eldrazi Titans (all), Conduit of Ruin, Void Winnower, Portal to Phyrexia, okay I'll stop now