Scourge of the Skyclaves Every modern MtG player will see the resemblance to Death's Shadow in Scourge of the Skyclaves
Plus, nothing can gain flying later with effects and such, so you are confident that your team will be unblockable again and again, turn after turn
Four mana is usually the sweet spot between efficiency and power but five is just an awkward spot that is hard to nail down
The Vault is surprisingly good in cube, it is usually comparable life to Vampiric to find a specific thing yet it also has the capacity to tutor for a couple of more vague things, say two lands and any sort of three drop
If my opponent is well prepared to fight my creatures (End Hostilities is a card that often gives me problems), a Planeswalker like Nissa is a great way to catch him or her unprepared
But a card like Adventurous Impulse that reveals a creature or land from your library wouldnt work with the Modal Double-Faced card Valakut Awakening/Valakut Stoneforge