War of the Spark brought it to every color combination with the exception of red, which remains stuck with just the rather unremarkable and non-repeatable Volt ChargeVolt Charge
Since it also generates tokens when you replay your Airbent creatures, Appa is a great way to break parity in crowded board states
That ended up being nine years later here in Zendikar Rising. So yes, although each version of Beyeen Coast/Beyeen Veil will naturally have both printed on it, you can only play it as one side or the other, and not transform it mid-mach
Creature - Goblin Soldier Color tag templates(None) Mogg War Marshal Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters or dies, create a 1/1 red Goblin creature token
If you don't need to find ways to spend spare mana late game then there is little point taking those early game risks