The key factors: The card is iconic (people will always want it) The PSA 10 population is genuinely low You're holding long-term (short-term fluctuations won't matter) The premium is within the historical range for that card (don't overpay even for a PSA 10) 2
As it is a ritual monster, at least two cards are going to be needed in order to get it out on the field, but it will very likely end up needing three or four
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Agadeem, the Undercrypt and Shatterskull, the Hammer Pass hurt you on occasion, but the opportunity cost to include them is low and makes all the mythic rare Zendikar Rising MDFCs great by default
While casting these, I recommend not moving much, as some opponents operate by Jurassic Park rules and may not notice you
(If it is in play, sacrifice it before sacrificing Reveillark)