Myth Unbound
Enchantment
Your commander costs 
less to cast for each time it's been cast from the command zone this game.
Whenever your commander is put into the command zone from anywhere, draw a card.
There are precious few names that echo throughout the Multiverse.
Alexander Forssberg
Treasure Chest (PZ2)
• #70663Rulings
If another player is somehow able to cast your commander, Myth Unbound’s first ability applies to that player’s spell.
(wotc • 2018-12-07)
Myth Unbound’s cost reduction applies after you apply the commander tax. In effect, this reduces the commander tax to {1}.
(wotc • 2018-07-13)
Myth Unbound’s cost reduction applies even if you’re casting your commander from a zone other than the command zone.
(wotc • 2018-07-13)
If Myth Unbound leaves the battlefield at the same time as your commander is put into the command zone, its last ability won’t trigger.
(wotc • 2018-07-13)
Rulings
If another player is somehow able to cast your commander, Myth Unbound’s first ability applies to that player’s spell.
(wotc • 2018-12-07)
Myth Unbound’s cost reduction applies after you apply the commander tax. In effect, this reduces the commander tax to {1}.
(wotc • 2018-07-13)
Myth Unbound’s cost reduction applies even if you’re casting your commander from a zone other than the command zone.
(wotc • 2018-07-13)
If Myth Unbound leaves the battlefield at the same time as your commander is put into the command zone, its last ability won’t trigger.
(wotc • 2018-07-13)