Not only does it give you additional copies of your creatures, but they gain haste for some extra aggression
Months later, a companion trading card game was produced, which contained 102 illustrated cards
They'll cast powerful spells, call upon classic summons, and even visit their favourite locations on the back of a Chocobo
So not only do you get to see extra cards, you get to stack your deck for the next turn too
Thanks to your commander(s), you should almost always have access to one legendary creature, so youll almost always be paying 1 or 2 mana instead of the full 3, but since the Channel effect is an ability and not a spell, it also ducks most countermagic, as well as pesky effects like Dragonlord Dromoka that keep you from casting spells