In Tiny Leaders, you may play any (non-banned) Planeswalker as your commander. Not only
To balance the power level, the commander tax to cast a Planeswalker commander is {3} mana instead of just {2}.
Like in regular commander, in Tiny Leaders you may have Commanders with the partner ability.
To balance the power level of having partner Commanders, the Commander tax to cast each individual partner is increased by {2} for each previous creature Commander cast and by {3} for each previous Planeswalker Commander cast.
Example 1: You first cast
Example 2: You cast
Note: Some Tiny Leaders variants reduced your starting hand size when playing with partner commanders. This variant does not do that. You still get to have a normal starting hand even when you have partner commanders.
Kaldheim brought a bunch of flip cards with spells on the front and backside, e.g.
"While a double-faced card is outside the game, in a zone other than the battlefield, or on the battlefield with its front face up, it has only the characteristics of its front face."
Comprehensive Rules, 711.4a
This means that cards that have a mana value of 3 or less on their front side are legal in Tiny Leaders, even if the backside has a mana value of more than 3.
"The back face of a double-faced card (see rule 711) is included when determining a card's color identity. This is an exception to rule 711.4a."
Comprehensive Rules, 903.4c
With the same logic of 711.4a, you can use a creature as your commander even if it has another type on the back side.
You can cast either the front or the back side when casting from the command zone. The tax only looks at the front side though, so if your commander
is e.g.
(Note that if more powerful such creatures are printed in the future, we might need to address this in the Tiny Leaders rules)
Different Tiny Leaders variants had different takes on decks with more than 3 colours. This ruleset does not restrict colors, so you are allowed to do 4 colour decks with partner commanders
that each provide 2 different colours, and 5 colour decks with a commander that has all 5 colours in its color identity
(e.g.