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If Deneb is able to activate in a new chain, surely the effect of Infernoid Decatron can as well, since it too is still public knowledge and incapable of missing its chance to activate if Special Summoned in a higher Chain Link
For those who don't know, Gruul is
Where could they be
SR Super Rare Bio-Insect Armor X EARTH Level 5 [ InsectEffect ] ATK 1500 DEF 2000 If this card is in your hand or GY and you do not control "Bio-Insect Armor": You can target 1 Insect monster you control
Its an instant, so you can use your creatures to block and immediately protect them from combat damage