Sunscape Familiar #17
Market Price
Raw
$2.32
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Card Details
Defender
Green spells and blue spells you cast cost 
less to cast.
“The spirits of fallen battlemages can serve their guilds as familiars by joining with any physical form.”
0/3
Illustrated by Brian Despain
Rulings (7)
Oct 4, 2004
Can never affect the colored part of the cost.
Oct 4, 2004
If a spell is both green and blue, you pay less, not 
less.
Oct 4, 2004
If this card is sacrificed to pay part of a spell's cost, the cost reduction still applies.
Oct 4, 2004
The effect is cumulative.
Oct 4, 2004
The generic X cost is still considered generic even if there is a requirement that a specific color be used for it. For example, "only black mana can be spent this way". This distinction is important for effects which reduce the generic portion of a spell's cost.
Oct 4, 2004
The lower cost is not optional like with some other cost reducers.
Oct 4, 2004
This can lower the cost to zero, but not below zero.