Both of these mechanics are fine
Picking one out from the bunch is a highly personal choice, there are no wrong answers
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Minerva, Lightsworn Maiden X LIGHT Level 3 [ Spellcaster / TunerEffect ] ATK 800 DEF 200 When this card is Normal Summoned: You can add 1 LIGHT Dragon-Type monster from your Deck to your hand, whose Level is less than or equal to the total number of "Lightsworn" monsters with different names in your Graveyard
I wanted the second mini block, Shadowmoor , to have its own theme that cared about something that would exist in Lorwyn , much as how Shadowmoor could have creatures of the proper creature types
It can deal damage to any target equal to the power of the creature entering, making it a strong addition to those game plans