mtg mirrodin besieged booster box Mirrodin Booster Box * The set introduces new mechanics including battle cry and living weapon magic mirrodin besieged booster box

Both the new sets and the new mechanics appear to have had an effect on the most valuable cards for this year

Their trigger reads, Whenever a land enters the battlefield under your control, you may gain control of target creature for as long as you control Roil Elemental. So, basically, as long as you can keep Roil Elemental alive, you can absolutely steal every other Creature on the battlefield

And, if a current character is threatening the field, you can keep your cards readied so they can't be challenged and protected, thanks to her Ward ability

The first player can finish their turn as normal from there, either by playing a character, item, action, or song or taking some other available action or no action at all

I see her fairing better in the long run, however, than the location/song cards on this list given her status at Disney Princess