You net one card drawn and two tapped tokens along with as many ETBs, death triggers, leaves the graveyard or card draw payoffs you need to win
If you ever draw more than seven cards, you must discard down to seven by the end of your turn
The official rules for meld cards are as follows: 701.34
Just be warned: Dredge expects you to bring in graveyard hate against them, so they'll be bringing in cards like Nature's Claim to counter your graveyard disruption, so sometimes just a single piece of graveyard hate isn't enough
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You can even use cards like Duelists Heritage or Lizard Blades to give Blinding Angel double strike and take away multiple combat phases