To add even more edge cases, Word of Command allows you to mandate and alternative casting costs are paid
My definition goes as follows: any effect that gives you access to two or more cards, either right now or over time
Some older sets introduced anime frames for staple cards like Brainstorm, Lightning Bolt, or Path to Exile, which can also be hot items among collectors
If there is no Lesson card in your graveyard when Dragonfly Swarm dies, the ability will not be put on the stack at all
And the last one is Floodborn
Meanwhile, Song-Mad Treachery is a card I really like for a reason similar to Pelakka Predation: people don't expect non-sacrifice decks to have Threaten effects, which means that Song-Mad Treachery can lead to some massive blowouts by stealing an unsuspecting opponent's best creature and smashing them with it