Its also a part of a good cycle of cards, with this one being one of the better ones
When players at the special Helvault Events got achievements, they could each physically break a seal on their store's own (cardboard) Helvault
Furthermore, this card plays perfectly with Skeletons that can return directly from your graveyard, such as Reassembling Skeleton or Forsaken Miner
In practice, this means we can play Champion of the Parish on Turn 1, Collector's Cage on Turn 2, and any two additional one-drops on Turn 3 (like Esper Sentinel, Novice Inspector, or Warden of the Inner Sky) and be able to activate Collector's Cage on Turn 3
This positions Slifer as a control-style God Card , focused on maintaining dominance rather than explosive finishes
Well, despite the fact that you can get away with not including them at a more casual table or in a deck with only one or two colors theres no denying their efficacy once you start to edge more competitive, or fancy playing a four- or even five-color build