As this decision will not affect anyone's playthrough in the long run, most Master Duel fans who are more familiar with the card battle mechanics will likely choose whatever fits their playstyle
Superdreadnought Rail Cannon Gustav Max is an effective card for ending the duel if you have two Eldlich the Golden Lord monsters on the field at once
The ones that were always errors and never corrected were somewhat cool in their own right but ehh, more of a knowledge enhancement for the card in question
Vigilance , Discard Sunblade Samurai: Search your library for a basic Plains card, reveal it, put it into your hand, then shuffle
BT1-066 U Digimon Lv.3 Tentomon BT1-067 U Digimon Lv.3 Palmon Color Green Cost 3 DP 1000 Digivolve Cost 1 Green 0 from Lv.2 Form Rookie Attribute Data Type Vegetation Card Text 1 [Effect] [On Play] Reveal 3 cards from the top of your deck
If you can give yourself the ability to cast this at instant speed, and youve got enough mana, you can basically protect everything you want to