Optional Spell Points variant

The default rule of Dungeon World is that Wizards can just cast a certain number of spell levels (Level+1) Clerics can Commune for the same number of spells, and everyone else in Core operates under the assumptions of any spells they chose for Multiclass Moves. It is with that in mind that I give you

Empowered Spellcasting

Replaces Commune or Prepare Spells

Instead of having to pray for spells or prepare spells, now you do that with Spell Points. You are not shoehorned into a restriction of which spells you can cast on any particular day, merely how many spell points you have. There are a few options here depending on what your GM wants to use

Eqivalent Spell Power

You get Level+1 Spell Points that you can spend as desired.

Attribute Based

You get Level+(Casting Attribute), where Casting Attribute for Clerics and Disciple (Class Warfare) based casters is +Wis, Casting Attribute for Wizards and appropriate Magician (Class Warfare) based casters is +Int, and Casting Attribute for Bards and other Magician (Class Warfare) casters is +Cha.

High Power

You get Level*Casting Attribute Spell Points.

Risks

As per normal spellcasting, there are risks associated with the amount of energy you spent to cast the spell. In this system it works differently. A badly cast spell generates a number of risk equal to its level. So a 3rd level miscast spell generates 3 points worth of effects

Variable

• Forget the Spell: Doesn't happen. You know the spells you know and that's it. You merely lose additional spell points, reducing risk by a point per Risk reduced.
• Let's Make a Deal: You are contacted by a powerful, potentially corrupting, entity. This removes all Risk Points your last failure or 7-9 generated.

1 point

• Unwanted Attention: A single Horde tagged creature appropriate to the spell or the area arrives. before your next turn.
• -1 to Cast: This lasts a number of your turns equal to the spell's Level

2 Points

• Unwanted Attention: A single Group tagged creature appropriate to the spell or the area arrives.before your next turn.
• Valuables are Damaged: When you roll Treasure, reduce the number of rolls you make by -1, or assume the value or amount of goods in a roll with a value or amount is halved.

3 Points

• Unwanted Attention: A single Solitary tagged creature appropriate to the spell or the area arrives before your next turn
• Environmental Effects: Everyone should Defy Danger for the remainder of Combat before they can make Hack and Slash attempts. If damage is to be had, the amount is either the Caster's Base Damage (possibly with added moves) or the Spell Damage, whichever is better. 

4+

Mix and Match: Choose effects from lower point value entries in combination with each other.

Backwards Compatibility

Some of the Risks are appropriate choices for 7-9 or 6- in games that don't otherwise use the rule.