The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard
The upside of Aether Rift is that you can potentially cheat creatures onto the battlefield that cost huge amounts of mana
Weaponcraft Enthusiast gives us the most bang for our buck on that front with three bodies for three mana, two of which are artifacts
Entei ex Legendary Pulse : End-turn draw for consistency (non-brick rate 85%)
Jurassic World dinosaurs made moderate sense appearing in Lost Caverns of Ixalan set boosters, but dinos were less than half of that set's identity: I don't remember vampires, Mesoamerican robot gnomes, or underground cave complexes featuring heavily in any of the Jurassic World films
Collectors will do anything to get the Umbreon V-Max alternate art card, which has become iconic for its value, but it isn't all the Evolving Skies holds, as every single one of the hard-to-pull alternate art cards are worth ridiculous prices