Ugin's Labyrinth may not be the threat itself, but you will see some players sideboarding Land Destruction just to deal with this
but a lot of these are absurdbly overpriced, so approach with caution
Top 5 Blue Common/Uncommons: Diversion Unit: A fun little Mana leak adjacent effect that is easily recurred Caelorna, Coral Tyrant: Two mana 0/8 is gonna be an 8/8 effectively in some builds Hulldrifter: Its Mulldrifter, but a Thopter
Affinity for artifacts (This spell costs one generic mana less to cast for each artifact you control
Plus, because those other, more-dangerous juggernaut minions exist in the meta, good Free Peoples decks have a gameplan to deal with single dangerous minions played over and over
This will earn you both XP and packs, which makes it a double whammy