Magic the gathering blocking attacking question?

had card says "when heart lash cinder comes play gets +x/+0 until end of turn. x number of red mana symbol in mana costs permanents control" had 2 of those. played them both putting them both @ 13/1 making attack 26. blocked 1/1 creature died , it. find little ridiculous attacked 26 blocked 1 , game moves on. happens? creature dies , rest of 25 attack gets thrown out window? (ik didn't have trample , i'm trample does. can see i'm ummm really? please help

so had card says "when heart lash cinder comes play gets +x/+0 until end of turn. x number of red mana symbol in mana costs permanents control" had 2 of those. played them both putting them both @ 13/1 making attack 26. blocked 1/1 his...

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