It's a straight-forward task, something important when starting a game as complex as Magic
Enchant your friends, rivals, and opponents with this playmat set featuring Princess Luna, Rarity, and Twilight Sparkle
Putting a P/T boost and trample anthem on a huge 5/5 with haste for the top end of your creature deck and jumping into combat just makes sense, so much so that Wizards has since printed toned-down versions like End-Raze Forerunners and Demolisher Spawn
When the spell or ability resolves, it checks the targets to make sure theyre still legal (that is, theyre still there and they still match the requirements of the spell or ability)
But with this, I can just cast it at the end of someone's turn, draw it, and cast it with all of my mana free