I mean, just consider the following
Sacrifice Dart Throw, then open an Attraction
Theyre usually a little bit easier to get your hands on too, because you can just buy an entirely new deck
You need to be heavy on green cards for this to pay off, but that's just fine with finishers like Craterhoof and Portal to Phyrexia
Any time that I talk about ETBs and copying abilities, it almost feels obligatory to mention Dockside Extortionist but there are plenty of other great choices too
24 Spells Monastery Swiftspear Lightning Bolt Path to Exile Gitaxian Probe Brainstorm Mother of Runes Kytheon, Hero of Akros Grim Lavamancer Faithless Looting Figure of Destiny Opt Seeker of the Way Young Pyromaner Abbot of Keral Keep Jace, Vryns' Prodigy Soulfire Grandmaster Lightning Helix Fire / Ice Raise the Alarm Monastery Mentor Jeskai Ascendancy Mantis Rider Stoke the Flames Treasure Cruise 16 Lands 3x Shock 3x Dual 3x Fetch Plains Celestial Colonade Battlefield Forge Clifftop Retreat Sea Chrome Coast Rugged Prarie Sulfur Falls Other strong contenders Snapcaster Mage Thundermaw Hellkite Jace, the Mind Sculptor Spell Pierce Spell Snare Daze more burn