Slagwoods Bridge

Slagwoods Bridge enters tapped.
Indestructible
{T}: Add {R} or {G}.

Mountain

As an additional cost to cast this spell, discard a card.
Draw two cards.

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent.

Whenever you gain life, each opponent loses 1 life.

You gain 3 life.
Storm (When you cast this spell, copy it for each spell cast before it this turn.)

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.)

Magecraft — Whenever you cast or copy an instant or sorcery spell, you gain 1 life.

Lightning Bolt deals 3 damage to any target.

Add {B}{B}{B}.
Threshold — Add {B}{B}{B}{B}{B} instead if seven or more cards are in your graveyard.