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Steel Hellkite

Flying
{2}: Steel Hellkite gets +1/+0 until end of turn.
{X}: Destroy each nonland permanent with converted mana cost X whose controller was dealt combat damage by Steel Hellkite this turn. Activate this ability only once each turn.

Rarity : Rare
Types : Artifact, Creature
SubTypes : Dragon
Artist : James Paick
Cost converted to mana : 6

Rulings

1 January 2011
If a nonland permanent has no mana symbols in its upper right corner (because it’s a token that’s not copying of something else, for example), its converted mana cost is 0.
1 January 2011
Steel Hellkite’s last ability destroys only nonland permanents whose converted mana cost is exactly equal to X, and only those controlled by players who have been dealt combat damage by Steel Hellkite this turn.
1 January 2011
It doesn’t matter who controlled those permanents at the time Steel Hellkite dealt combat damage, or if those permanents were even on the battlefield at that time.
1 January 2011
You may activate the last ability even if Steel Hellkite hasn’t dealt combat damage to any players that turn. If you do, the ability won’t do anything.
1 January 2011
If Steel Hellkite’s third ability is activated with X equal to 0, it will destroy each nonland permanent with converted mana cost 0 the appropriate players control.
1 January 2011
The converted mana cost of a permanent is determined solely by the mana symbols printed in its upper right corner, unless it’s copying something else (see below). The converted mana cost is the total amount of mana in that cost, regardless of color. For example, a card with mana cost {3}{U}{U} has converted mana cost 5.
1 January 2011
If a permanent is copying something else, its converted mana cost is the converted mana cost of whatever it’s copying.
1 January 2011
In all cases, ignore any alternative costs or additional costs (such as kicker) paid when the permanent was cast.
1 January 2011
If the mana cost of a permanent includes {X}, X is considered to be 0.

Forest

({T}: Add {G}.)

Duelist's Heritage

Whenever one or more creatures attack, you may have target attacking creature gain double strike until end of turn.