With 4 coin flips, the chance of Zapdos doing no damage at all is only 6.25%, making it a very consistent attacker
Create a token that's a copy of target creature an opponent controls, except it's not legendary and it's a 2/2 Coward in addition to its other types
Also, the equipped creature gets +2/+2, and whenever it deals combat damage to a player, surveil two, and you may cast an instant or sorcery card from your graveyard with a mana value of two or less without paying its mana cost
Even if Takenuma was a relatively bad mill spell, the fact you can play the first copy over a basic Swamp at almost no penalty to your manabase would get it into tons of lists
Its monocolor, instant speed, gets you back any previously-milled threat, and has some pretty significant interactions with other powerful spells including the number one self-mill effect on our list 1