At that time, there weren't enough Learn cards to justify Lessons taking up sideboard slots, either
Released in the Modern Horizons 3 MTG set last year, Ripples of Undeath is a two mana enchantment that's a super cool card advantage spell for graveyard decks
A friend of mine used to run in my list the old green and black cycling land and switch them for the cycling duals, making room for the 3 others, and I totally supported his choice
The elves of Lorwyn are famous about feeling that others don't match up to their high ideal of perfection, so the ETB being a kill spell that kills non-Elves plays squarely into that flavor
If there's a cost associated with having it attack, its controller isn't forced to pay that cost
Ive seen a lot of people playing cycling-themed decks