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This is the number of charge counters needed to enable that line , which can be put onto the card by tapping creatures

I feel bad. As Tumblr user Rcardolongo comments, part of this reaction likely stems from these cards being Modern legal

While Allosaurus Shepard's stats are nothing to write home about, being a 1/1 for one, it totes an ability that for six mana, can alter each Elf creatures under its owners control to have a base power and toughness of 5/5

Hitting two permanents and bringing them back immediately also opens this blue instant up to some shenanigans, like targeting Archaeomancer and Gilded Lotus which allows you to re-cast it infinitely

I'd be curious about also trying this in more of a Mono-White Control deck, with Carrot Cake and Enduring Innocence