Magmasaur

Magmasaur enters the battlefield with five +1/+1 counters on it.
At the beginning of your upkeep, you may remove a +1/+1 counter from Magmasaur. If you don't, sacrifice Magmasaur and it deals damage equal to the number of +1/+1 counters on it to each creature without flying and each player.

Mother of Runes

{T}: Target creature you control gains protection from the color of your choice until end of turn.

Aether Flash

Whenever a creature enters the battlefield, Aether Flash deals 2 damage to it.

Enlightened Tutor

Search your library for an artifact or enchantment card, reveal it, then shuffle and put that card on top.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Circle of Protection: Red

{1}: The next time a red source of your choice would deal damage to you this turn, prevent that damage.