For the former, there are lots of enter-the-battlefield venture triggers, like those found on Veteran Dungeoneer, Radiant Solar, Nadaar Selfless Paladin, and Find the Path
Granted, those decks are almost all focused on milling out the opponent but the original Hedron Crab is also able to target yourself, which makes it one of the most explosive and mana-efficient self-mill engines ever printed
Star-Crossed Lovers: The male and female Nidoran from the Orange Islands episode "Wherefore Art Thou, Pokmon?", an obvious Shout-Out to Romeo and Juliet
This focus on artifacts also heavily influences many formats, including Commander and Modern
Plundering Predator costs five, has a 3/3 flying body to swing and win, and an ETB trigger with you discarding and drawing a card, which is a may effect
This card is experiencing small rises over time, as it finished at around $35 in 2023 before finding its footing in 2024 and soaring into the $37 range