Morph is one of those mechanics in Magic: The Gathering that’s a blast to play with. It’s almost anti-MTG, because you plop your creature down, nobody knows what it is except you, and then you get to flip it over dramatically, usually while shouting “you’ve just activated my trap card!”
It’s not just fun, it’s actually one of the better mechanics to build around in Commander, or just sprinkle into your normal decks. So, let’s dive into both it and megamorph, because they belong together, and see what’s what.
The best morph cards in Commander

We’re going to stick to three cards in both sections today. First up is
Den Protector

Megamorph {1}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)
When this creature is turned face up, return target card from your graveyard to your hand.
. This is a two-mana 2/1 with megamorph that can’t be blocked by creatures with less power than it. Most importantly though, “When Den Protector is turned face up, return target card from your graveyard to your hand.” This is perfect for picking your best card and just casting it again.
Next is
Kheru Spellsnatcher

When this creature is turned face up, counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may cast that card without paying its mana cost for as long as it remains exiled.
, which reads, “When Kheru Spellsnatcher is turned face up, counter target spell. If that spell is countered this way, exile it instead of putting it into its owner’s graveyard. You may cast that card without paying its mana cost for as long as it remains exiled.” Taking a spell of your choice is absolutely incredible, and shouldn’t be underestimated.
Finally, we’ve got
Deathmist Raptor

Whenever a permanent you control is turned face up, you may return this card from your graveyard to the battlefield face up or face down.
Megamorph {4}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)
. This is a three-mana 3/3 with deathtouch that reads, “Whenever a permanent you control is turned face up, you may return Deathmist Raptor from your graveyard to the battlefield face up or face down.” Being able to recur a deathtouch creature at instant speed is a huge boon.
Read More: Is Garth One-Eye A Good Commander?
The best morph support cards in Commander

The most entertaining morph support card has to be
Kadena, Slinking Sorcerer

Whenever a face-down creature you control enters, draw a card.
. This commander, and it should be your commander, is a four-mana 3/3 in black, green, and blue that allows you to cast your first face-down creature each turn for free. Plus, whenever a face-down creature enters under your control, you get to draw a card.
Next is
Secret Plans

Whenever a permanent you control is turned face up, draw a card.
, which is a two-mana enchantment that’ll give your face-down creatures +0/+1 and lets you draw a card whenever a permanent you control is turned face up. Card advantage, shockingly, is very good in MTG.
Last but not least, we’ve got
Whisperwood Elemental

Sacrifice this creature: Until end of turn, face-up nontoken creatures you control gain "When this creature dies, manifest the top card of your library."
, a five-mana creature that reads, “At the beginning of your end step, manifest the top card of your library. Sacrifice Whisperwood Elemental: Until end of turn, face-up nontoken creatures you control gain “When this creature dies, manifest the top card of your library.”” You want your cards face-down anyway, so this is just free real estate.