You can also banish 2 Spell Cards from your Graveyard in order to Special Summon 2 "Spell Strikers".
Discard "Skull Conductor" to Special Summon 2 copies of "Burning Skull Head" from your hand, inflicting 2000 damage to your opponent in the process; then Xyz Summon this card, destroy one of your opponent's monsters in battle, activate its effect and inflict more 1000 damage.
You can special summon a "Gilasaurus" and Normal summon another level 3 monster to easily Xyz summon this card, Gilasaurus' effect can provide a monster to destroy so you can activate Grenosaurus' effect.
Another way is to summon Achacha Archer to deal 500 damage, then use Achacha Chanbara's effect to deal 400 then xyz summon this card. From NumberAstral