Battle with Splinterland Rule : Standard

Standard : No modification to the standard gameplay rules and mechanics.

We are have same strategy to win the battle with this rule, need power full pow in first card, but the winner is quality of choice of next cards.

My choice Silvershield Assassin is RARE Life Monster with two ability ; target last monster instead first monster and attack twice each round, like have two monsters use this one.

Please give me your better strategy?