Your rear-guard is not safe from Setsuna unless it cannot be targeted.
D-TB02/020 RR 2021 禁忌ノ幽鬼 刹那 Taboo Ghost, Setsuna
Grade 3 / Normal Unit / Monster Strike – Fiend
[CONT](RC):This unit may attack a back row unit.
[AUTO](RC):At the end of the battle this unit attacked your opponent’s rear-guard, choose one of your opponent’s rear-guards this unit attacked this turn, and retire it.
D-TB02/058 C 2021 甘き夢へと誘う者 サキュバス Bewitching Dream, Succubus
Grade 2 / Normal Unit / Monster Strike – Succubus
[AUTO](RC):At the end of the battle this unit was boosted, if that attack did not hit, COST [Counter Blast (2)], and [Stand] this unit.
D-TB02/056 C 2021 創世の始神 イザナギ Worldmaker, Izanagi
Grade 3 / Normal Unit / Monster Strike – Deity
[CONT](RC):During your turn, if “Netherworld Creator, Izanami” is on your (RC), this unit gets [Power]+10000.