20 creatures
goblin wardriver *2 (whenever this creature atack, other creatures +1/+0)
goblin bushwacker *4 (creatures haste +1/+0)
rakdos something*3
foundry street denizen*4 (when another red creatures enter the battlefield +1+0)
frenzied goblin *3 when atacks you may pay R if you do target creature dont block.
Mardu scout *2 pay (2) dash
Lightning Berserker *2 OR goblin arsonist *2

= 20

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20 spells

goblin grenade *4
brimstone volley*2
brute force*4
tormenting voice*2
magma jet *2
krenko´s command*4
Hordeling Outburst*4