The Magical City, New (UNK-RL01B) [Unknown Event]

The Magical City, New enters the battlefield tapped.
: Add , , or . When this mana is spent to cast a legendary spell, put a +1/+1 counter on this land.
{4}: The Magical City, New becomes a 1/1 white, blue, and red Human Artist creature until end of turn.
The Magical City, New can be your Commander. (Commander tax still applies.)