Creature â Elemental
: Put a blaze counter on target land without a blaze counter on it. For as long as that land has a blaze counter on it, it has "At the beginning of your upkeep, this land deals 1 damage to you." (The land continues to burn after Obsidian Fireheart has left the battlefield.)4/4
The ability gained by the land triggers at the beginning of the upkeep of the landâ€™s controller, not the beginning of the upkeep of Obsidian Fireheartâ€™s controller. The player who controls the land at the time the ability triggers is the one whoâ€™s dealt damage.
If all blaze counters on a land are moved to a different land, the triggered ability doesnâ€™t follow them. The first land no longer has the ability because it no longer has a blaze counter on it. The second land doesnâ€™t have the ability because Obsidian Fireheart didnâ€™t target it.
If a land ends up with more than one blaze counter on it (thanks to Doubling Season or Gilder Bairn, for example), the ability still only causes it to deal 1 damage to its controller each turn.
As the reminder text indicates, whether the targeted land has the triggered ability thatâ€™s been granted to it depends only on whether it has a blaze counter on it, not on whether Obsidian Fireheart is still on the battlefield.
A land with a blaze counter on it is an illegal target for this ability. You may activate the ability targeting a land, then activate the ability in response to itself targeting the same land. Although the first ability to resolve will put a blaze counter on that land, the second ability to resolve wonâ€™t resolve.
BUY THIS CARD