yugioh duel links toon cards deleted by user] : r/DuelLinks

Why the sudden surge

UR Ultra Rare Jormungandr, Generaider Boss of Eternity X EARTH Rank 9 [ ReptileXyzEffect ] ATK

is to give the user a chance to search for any specific tool in their deck

Azamina Mu Rcielago X DARK Level 6 [ IllusionFusionEffect ] ATK 2000 DEF 2400 1 Illusion monster + 1 LIGHT Spellcaster monster Monsters your opponent controls lose 500 ATK/DEF for each "Azamina" monster you control

The official mulligan rule in Commander is the same London Mulligan used in all other formats

In this case, your creatures will be gaining +1/+1 (Power/Toughness) counters, and your Planeswalkers will be gaining Loyalty counters