mtg invasion booster box or cards that are concerned with creature types. Episode 258 - Phyrexia Phryday:

A string of alarming murders streaks across the plane of Ravnica, and players will step into the shoes of Ravnica's greatest detectives to track the clues and crack the case

Then you have an attack trigger, to have one target attacker connive equal to attacker count

Since it's not a planeswalker or legend, the questions we need to answer is, "Do we consider Obsidian Fireheart to be epic?" The idea that you can light lands on fire and use them to burn an opponent is sort of epic, but it's a lot like a Curse of the Pierced Heart that costs seven-mana

If the format features multiple decks where that ability would be useful, I would definitely be interested in giving this card a shot

Siona, Captain of the Pyleas is another choice at the top end of our shallow mana curve, but she provides a lot of value in retrieving a choice aura and then giving us fodder to sacrifice to our opponents, such as Doom Foretold