The lands entering tapped trigger is a weird riff on ones like the fastlands (ala Darkslick Shores) - tapping for colorless is a very good ability on lands like these, since it makes it so that the caster can use the land without having to dome themselves repeatedly
Phlage, Titan of Fires Fury Phlage, Titan of Fire's Fury reminds us once more that recursive threats are nasty
That said, the big stat boosts work particularly well with all of the evasion, especially Den Protector, who becomes a 5/4 that is 98% unblockable and the perfect size for killing Elspeth
You might like The Sword Released
It could also mean a new type of card or item that can be equipped to a character like Armor or a weapon
For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty and only if you have an available land play remaining