Activating Yuriko's commander ninjutsu ability isn't the same as casting Yuriko as a spell
It's a rigid, protective sleeve that safeguards your trading cards
Of that list, Forest, Island, Mountain, Plains, and Swamp are the basic land types
Grim Monolith Playing a Grim Monolith on turn two and waiting for an important turn to slam the additional mana could lead to a turn three Tivit, Seller of Secrets which can be very oppressive in that kind of deck
You need the same energy type and amount, but if youre lucky enoug,h it can come in handy
Until the end of your opponent's next turn after this card resolves, Spell/Trap Cards your opponent controls cannot be destroyed (by battle or card effect), also their activation and effects cannot be negated