Here, let me give you a quick example: Prior to Invasion Block, here were the instant/sorceries that destroyed a target enchantment, in the order they were printed: Of those, only Serene Offering had an on-resolution benefit of gaining some life
They can be used in forming your deck
Ixalan features a cycle of mono-color enchantments and five artifacts, while Rivals of Ixalan features a cycle of enemy-color enchantments, an artifact, and an artifact creature
5 Pokemon Fan Club: POP Series 4 (Uncommon) $94.97 So Meta POP Series 4's Pokemon Fan Club pays homage to the group of the same name that appears in the series with sporadic cameos
Generally speaking, you should choose one or the other when building a U/R Delver deck
Cards would help you move your meeple and care about what Room your meeple was in