There are 108 multicoloured Planeswalkers: 12 Azorius (white/blue) 12 Golgari (black/green) 12 Gruul (red/green) Ten Izzet (blue/red) Nine Dimir (blue/black) Nine Orzhov (black/white) Nine Simic (green/blue) Eight Boros (red/white) Seven Rakdos (black/red) Seven Selesnya (green/white) Six Grixis (blue/black/red) Two Bant (green/white/blue) Two Esper (white/blue/black) One Jund (black/red/green) One Temur (green/blue/red) One Jeskai (blue/red/white) Of course, some characters have more Planeswalker cards than others
If you put six or more mana into the spell, you get to blow up all noncreature, nonland permanents first
These all give you access to powerful removal, counterspell, and protection, something very much appreciated in a deck like Calvary Charge that wants a lot of creatures on the battlefield on your side and little on your opponents'
Centering: Significant off-centering is more acceptable in this category
You can also go down the pod or toolbox route, finding permanents with powerful enter the battlefield abilities for any situation, whether its Eternal Witness, Noxious Gearhulk or Aether Channeler to name but three
Enchantment - Class Color tag templates(None) Rhystic Study Whenever an opponent casts a spell, you may draw a card unless that player pays