The lignin in paper fibers breaks down and creates acidic compounds that yellow the card from the inside out
What interests me here is that you can still pay five mana to get most of an Austere Command without being in an Energy deck
UR Ultra Rare Dogmatika Fleurdelis, the Knighted X LIGHT Level 8 [ SpellcasterEffect ] ATK 2500 DEF 2500 During the Main Phase, if a monster Special Summoned from the Extra Deck is on the field (Quick Effect): You can Special Summon this card from your hand, then, if you control another "Dogmatika" monster, you can negate the effects of 1 face-up monster on the field, until the end of this turn
SE Secret Rare Frightfur Cruel Whale X WATER Level 9 [ FiendFusionEffect ] ATK 2600 DEF 2400 1 "Edge Imp" monster + 1 "Fluffal" monster If this card is Fusion Summoned: You can destroy 1 card on both players' fields
Even in attack mode, Super Doras attack is high enough to get over most enemies, making it a great monster to hold things down by himself for a time