Potential sideboard notes
Spreading sees - any tron decks or manlands
Molten Rain - any tron decks or manlands
Twisted image - kills noble heirarchs, spellskites, ornithopters,
Counterflux - storm and other combo decks
Izzet Staticaster - soul sisters, some melira, tokens, sometimes storm, sometimes affinity fairies, some jund, some orzhov
Combust - kiki pod, UWR Control, splinter twin, merfolk
magma spray - pod variants, affinity, merfolk
negate - control and combo
Spellskite - splinter twin, jund, UWR control, burn, affinity, infect, hexproof
Engineered Explosives: Affinity, Jund, Merfolk, random little creature decks, Hexproof, infect
Grafdigger's cage - pod, gy combo decks
Keranos UWR control
Actual 15 card sideboard:
1 x Keranos God of Storms - for decks that take a while - UWR and Pod
1 x Engineered Explosives - for Tarmogyf and affinity
2 x combust - twin and UWR
3 x negate - scapeshift, UWR,
2 x molten rain - tron, scapeshift , UWR
1 x spellskite - hexproof, infect, scapeshift,
2 x shattering spree - affinity and Tron
2 x Counterflux - UWR, storm
izzet staticcaster
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Less helpful cards in matchups (to be sideboarded out)
Affinity - Remand, spell pierce
TWin - spell snare, pillar of flame
UWR - vapor snag, pillar of flame, spell pierce
GR Tron - electrolyze, pillar of flame
scapeshift - vaporsnag, pillar of flame, electrolyze
Burn - electrolyze, vapor snag, git probe
Pod - spell snare, git probe
JUND - Pillar of flame, electrolyze