Mass land destruction is often frowned upon in MTG 's Commander format, for example, as it dials back each player's progress in the game by multiple turns, and slows the game down a lot
Delver of Secrets and Haughty Jinn are both solid fliers
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I think one of the reasons for that is simple
Put the counters on Sage of Hours, and then immediately sacrifice them all with its ability to get an extra turn
That means your army hits harder while still staying back to defend