Gleeful Demolition

Destroy target artifact. If you controlled that artifact, create three 1/1 red Phyrexian Goblin creature tokens.

Fiery Conclusion

As an additional cost to cast this spell, sacrifice a creature.
Fiery Conclusion deals 5 damage to target creature.

As an additional cost to cast this spell, sacrifice an artifact.
Shrapnel Blast deals 5 damage to any target.

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

Defender
Whenever Shield Sphere blocks, put a -0/-1 counter on it.

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

First strike, menace, trample
Partner (You can have two commanders if both have partner.)

{T}, Sacrifice Mishra's Bauble: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.

As an additional cost to cast this spell, sacrifice a Goblin.
Goblin Grenade deals 5 damage to any target.

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.)

As an additional cost to cast this spell, sacrifice an artifact.
Create three 1/1 red Goblin creature tokens.