Traveling Chocobo

The third line is where this stops being a top-of-library Bird payoff and turns into an engine piece. Reading the top card and playing lands or Birds off it is familiar ground: Oracle of Mul Daya and Courser of Kruphix have handed green players a wider land clock for years. But the doubling clause reaches sideways into the landfall and enters-the-battlefield space that green and its partner colors are built around. Every land you drop, every Bird that resolves, checks whether it lit up a triggered ability of a permanent you control, and if it did, that ability fires twice. Play a fetch land into a Lotus Cobra and you get two mana triggers; drop a land with Tireless Provisioner in play and you double the token or the Treasure. What keeps this from being a blanket doubler is the entry condition: the trigger has to come from a land or a Bird entering, not from anything else, which means the more of your triggers a deckbuilder routes through those two entry points, the more the clause pays. It leans on two of the oldest green engine axes at once, the top-of-library grind and the landfall cascade, and rewards stacking them rather than picking one. The body is incidental; the value lives in how many times per turn a permanent's enter-trigger can be made to count double.