Not only that, but it can trigger multiple times per turn just by casting non-creature spells
You can have a deck filled with lessons that thrives on casting them, or have these as a toolbox in your sideboard for when a special need arises
-5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn
Not only does Seasoned Dungeoneer give you the initiative when it enters the battlefield, but you also get two powerful combat triggers
Everyones favorite robot, Solemn Simulacrum, also makes a list, which isnt surprising either since its a key way of ramping out lands in decks without green
To examine this, let's take a look at a similar spell: Little Man Down Sorcery Target player reveals his or her hand and discards the non-land card in their hand with the lowest converted mana cost