Prototype {3}{G} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) When Boulderbranch Golem enters the battlefield, you gain life equal to its power.

Trample

Menace (This creature can't be blocked except by two or more creatures.) Discard a card, Sacrifice Insolent Neonate: Draw a card.

Hexproof (This creature can't be the target of spells or abilities your opponents control.) Whenever Spined Megalodon attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

When Bitter Reunion enters the battlefield, you may discard a card. If you do, draw two cards. {1}, Sacrifice Bitter Reunion: Creatures you control gain haste until end of turn.

Add {B}{B}{B}.

Bloodfell Caves enters the battlefield tapped. When Bloodfell Caves enters the battlefield, you gain 1 life. {T}: Add {B} or {R}.

({T}: Add {R}.)

Rakdos Carnarium enters the battlefield tapped. When Rakdos Carnarium enters the battlefield, return a land you control to its owner's hand. {T}: Add {B}{R}.

Each player puts a creature card from their graveyard onto the battlefield.

Draw two cards, then discard two cards. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

({W/P} can be paid with either {W} or 2 life.) Target artifact or creature you control gains protection from artifacts or from the color of your choice until end of turn.