When Karumonix enters, look at the top five cards of your library
You can only use this effect of "Return of the Monarchs" once per turn
For the low, low cost of one card, you get to attack again, draw a card, and use all of your mana a second time, plus get a crack at additional upkeep/end step triggered abilities and all that good stuff
SUDA-EN086 D.D
(When an opponent's Digimon attacks, you may suspend this Digimon to force the opponent to attack it instead.) Promo Info start deck RAGNALOARDMON[ST-13] CLOSECLOSE ST13-10 C Digimon Lv.4 Gladimon Color Black Form Champion Attribute Vaccine Type Warrior DP 4000 Cost 4 Digivolve Cost 1 1 from Lv.3 Digivolve Cost 2 - Upper Text - Lower Text - Promo Info start deck RAGNALOARDMON[ST-13] CLOSECLOSE ST13-11 U Digimon Lv.4 TiaLudomon Color Black Form Champion Attribute Data Type Armor/Legend-Arms DP 4000 Cost 5 Digivolve Cost 1 2 from Lv.3 Digivolve Cost 2 2 from Lv.3 Upper Text [On Play] By placing this Digimon under 1 of your other Digimon that's red or has [Legend-Arms] in its traits as its bottom digivolution card, 1 of your Digimon gains Reboot until the end of your opponent's turn
As you could see from the list above, I definitely named a large number of cards that will see play