Even better, it easily it transforms into Cecil, Redeemed Paladina 4/4 lifelinker that gives your other attacking creatures indestructible whenever it swings
Tranquil Cove and Rugged Highlands can make one of two different colors of mana, white or blue and red or green
The five mythic Dragons and Tiamat from Adventures in the Forgotten Realms started it, and the more recent combinations of Dragon goodness in Battle for Baldurs Gate that included Miirym, Sentinel Wyrm has really pushed it up lately
Yes, granting a creature hexproof will stop a targeted fight spell from resolving , since fight spells or abilities need to target the two creatures involved
The Wingulls, absolutely oblivious to anything going on at all, and the Swablu who absolutely understands that it doesnt belong
Transforming a Valki or Will/Rowan will kill the other side instantly, for example, since it needs to enter to receive its starting loyalty counters