Once exiled you can play it up until the end of your turn
Your current required fields and signup rules stay exactly the same
With a healthy amount of HP, Entei can stick around in your Active Spot to help draw you cards with its Fleet-Footed ability, letting you draw a card once per turn
I believe it all depends on how you build your deck
How to Tell if a Magic: The Gathering Card is Fake Check the Card Weight
Mono-Black Conqueror with Bloodthirsty Conqueror 2 Anoint with Affliction 4 Bloodletter of Aclazotz 3 Bloodthirsty Conqueror 2 Cut Down 4 Deep-Cavern Bat 2 Duress 2 Enduring Tenacity 1 Go for the Throat 2 Mirrex 2 Preacher of the Schism 1 Sheoldred, the Apocalypse 1 Soulstone Sanctuary 2 Starscape Cleric 22 Swamp 4 Unholy Annex // Ritual Chamber 4 Unstoppable Slasher 2 Virtue of Persistence 1 Bladecoil Serpent 1 Cut Down 1 Darkstar Augur 1 Deadly Cover-Up 1 Duress 3 Ghost Vacuum 2 Liliana of the Veil 1 Liliana, Dreadhorde General 2 Malicious Eclipse 1 Outrageous Robbery 1 Sheoldred, the Apocalypse Alongside the old favorite of Rakdos Pact, Foundations has also brought in a new combo revolving around Bloodthirsty Conqueror, which triggers whenever your opponent loses life, allowing you to gain a life in return