It's great for that, but it just feels a little too on the nose
At the same time, EDH is still a format with big CMC threats regardless of deck price, so it also makes sense that this trend is only a slight one
The only spells that can be cast for free that are legal in Historic are Mindbreak Trap and Archive Trap, and both cards require your opponents to have done a specific action in order to do so
Captain Sisay (Sisay) Gerrard, Weatherlight Hero (Gerrard) Gix, Yawgmoth Praetor (Gix) Karn, Legacy Reforged (Karn) Mirri, Weatherlight Duelist (Mirri) Multani, Yavimaya's Avatar (Multani) Squee, Goblin Nabob (Squee) Titania, Protector of Argoth (Titania) Urza, Lord High Artificer (Urza) Xantcha, Sleeper Agent (Xantcha) With non-English text[] Several cards with "original card file" with non-English text