mtg test cards Mystery Booster playtest pre-review: Red Slivers you control have hope Cranial Insertion | This is
Description
Laboratory Maniac is a classic
There have been plenty of Eternal decks that play no creatures

Take a look at Empty the Warrens

The other reason to not overload on learn cards is there are diminishing returns casting Lessons

These "symmetrical" artifacts impact the board equally, but Urza's ability to tap artifacts at instant speed gives you a way to break that symmetry to make sure that you will be the only player at the table actually casting spells

Seal of Fire is always happy to be thrown onto the table for later use
