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This means that, for example, you can't activate an equip ability between combats.

If you have a sideboard, this can include up to 15 cards

This will cause any other white Auras attached to that creature to be put into their owner's graveyard, but Flickering Ward will remain on the battlefield.

Considering all possible card types in magic at the moment (the normal card types are artifact, battle, creature, enchantment, instant, land, planeswalker, sorcery, and kindred (ex tribal)), we get the maximum hypothetical size of Tarmo equal to 9/10

The rest of the deck is filled with cards that either are creatures that modified themselves, have effects that let you modify creatures, or are spells that help modify your creatures

Skymarch Bloodletter, Sovereigns Bite, Lichs Caress, Leonin Vanguard, and Herald of Faith are a few of the obvious options