By "all", you mean the totality? If so, it doesn't work like that.Originally Posted by YourMaster
The Scavenger Room will attract your creatures from the portal only if you haven't reached the max amount of creatures allowed. Once you have reached it, you can no longer siphon the minions from the pool, but you WILL attract the enemy/neutral creatures. Therefore, if the enemy creatures can get all of the remaining creatures available in the pool, you can have them all.
For example, there's 20 dragons in the pool. You manage to get 9 of them through your portal now that you have reached your max amount of minions, the remaining 11 ones are either still in the pool or maybe the computer player has some of them. Let's say the computer has 7 dragons. You'll be able to get 16 of them by scavenging. When you scavenge the enemy dragons, his amount of max creatures will drop and maybe a new dragon will emerge from his pool. If you're lucky, you will siphon this dragon as well, but if you're not, then you'll have to figure a way to reduce his amount of creatures to attract more. If you scavenge other minions, then maybe some more dragons will arrive and you could be able to get the extra 4 remaining.