They can offer a variety of effects that can help you protect your most important cards or deal additional damage to your opponent
If Mardu isnt your thing, it might be worth spending $3-4 on a copy of this
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owners control with a -1/-1 counter on it.) Illustrated by Ralph Horsley Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Might try to find room for it myself, although green 3s are always brutal competition
(i'd recommend notecards but honestly anything that fits all the text will do the trick.) BTW, if you think you have an idea for a plane that you think could be fun, feel free to make your own planeschase ideas and comment them below, because some of the cards in this planar deck were born from other people doing the same thing
Thats very achievable, especially in steel decks, so keep some ink handy and fill your hand full of cards