Whenever this creature attacks, add or . Until end of turn, you don't lose this mana as steps and phases end.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Whenever a permanent is returned to a player's hand, that player discards a card.

Exile target card from a graveyard. Create a 1/1 white and black Spirit creature token with flying.

Spitting Earth deals damage to target creature equal to the number of Mountains you control.

Kicker (You may pay an additional as you cast this spell.)
Flying
When this creature enters, if it was kicked, tap up to two target creatures.

(: Add .)

Target creature gets -2/-2 until end of turn.

Whenever a nontoken creature you control dies, create a 1/1 green Saproling creature token.

Enchant creature
Enchanted creature can't attack or block.

Commander creatures you own have "The first Dragon spell you cast each turn costs less to cast."

Flying, haste
When Jack of Hearts dies, he deals damage equal to his power to each creature.
Power-up — : Discard your hand, then draw three cards. Put two +1/+1 counters on Jack of Hearts. (Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)

This land enters tapped.
: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Teamwork 2 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more.)
Draw three cards. Then discard a card unless this spell was cast using teamwork.

: Add .
, , Discard a card: Return this creature to its owner's hand.

Flash
When Red Guardian enters, destroy target creature an opponent controls that dealt damage this turn.

Whenever this creature enters or attacks, you lose 1 life and create a Junk token. (It's an artifact with ", Sacrifice this token: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")
Whenever a token you control leaves the battlefield, put a +1/+1 counter on this creature.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Enchant creature
Enchanted creature gets +0/+2 and can block creatures with landwalk abilities as though they didn't have those abilities.

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
, Sacrifice this enchantment: Search your library for up to X basic land cards, where X is your speed. Put those cards onto the battlefield tapped, then shuffle.