Weltenverzauberung
Kreaturen können einen Spieler nicht angreifen, es sei denn, jener Spieler hat in seinem letzten Zug einen Zauberspruch gewirkt oder eine bleibende Karte, die kein Spielstein ist, ins Spiel gebracht.
Arboria’s effect cares about the actions taken by players, not their results. If a player cast a spell during their last turn but that spell was countered, that player may still be attacked. The same is true if a player put a nontoken permanent onto the battlefield during their last turn, but that permanent left the battlefield before their turn ended.