Frost Spear is essentially Landorus- EX s Hammerhead, at the cost of 1 Water and a C Energy, dealing 30 damage to the active and 30 to 1 of your opponents benched Pokmon
No matter which combination of modes you choose, you always follow the instructions of a Season in the order they are written
During your Main Phase, except the turn this card was sent to the GY: You can banish this card from your GY, then target 1 Synchro Monster in your GY
Chaos Form lets you Tribute monsters from your hand or field and/or banish Blue-Eyes White Dragon or Dark Magician from your Graveyard, in order to Ritual Summon a monster whose Level is exactly equal to the Level of the monster you Summon with Chaos Form
If you need extra Credits, try picking up 400 codes of a set that you havent collected on Live yet, like Rebel Clash, to get a bunch of extra Credits (and cards to complete your collection)
I like this card quite a bit more than Dark Apostle because of its cheaper activation cost plus sacrifice synergies