When this creature enters, create a 2/2 blue and black Zombie Rogue creature token, then put two +1/+1 counters on that token for each spell you've cast this turn other than the first. Plot {4}{U}
Start your engines! When this enchantment enters, it deals 5 damage to up to one target creature or planeswalker. {2}, Sacrifice this enchantment: It deals 2 damage to each player who doesn't have max speed.
Chroma — When this creature enters, it deals damage to target creature equal to the number of red mana symbols in the mana costs of permanents you control.
A boggart's mind is a tinderbox of volatile thoughts, hungry for a spark.
Each time target permanent would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead. Splice onto Arcane {2}{R}{R}
When this creature enters, put a +1/+1 counter on another target Elemental you control. Whenever another creature you control dies, you gain 1 life. If that creature was an Elemental, put a +1/+1 counter on this creature.
Freerunning {2}{R} Untap all creatures you control that attacked this turn. If it's your main phase, there is an additional combat phase after this phase, followed by an additional main phase.
Menace Whenever this creature deals combat damage to a player, it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)
Creatures you control gain vigilance and trample until end of turn. Roll a d20. 1—9 | Creatures you control get +2/+2 until end of turn. 10—19 | Put two +1/+1 counters on each creature you control. 20 | Put four +1/+1 counters on each creature you control.