Mosswood Dreadknight needs to be banned from all formats and is part of what's wrong with standard
Ever wondered why standard is so bad right now? This is why. You keep printing all these cards with absurdly overpowered abilities that resemble more what amateur custom cards used to be rather than more balanced cards like what used to be in the past.
Mosswood Dreadknight is just another example of a poorly designed card that never should have been printed and good playtesters should have caught and removed from the set before printing.
Getting to draw a card for a tiny cost, play a creature, then when the creature is destroyed, you get to draw another card for no additional mana cost, let it get destroyed, and repeat. And trust me, the 1 life lost is NOTHING. It does NOTHING to balance this.
The solution to improve standard is to go through all the sets in standard and mass ban all the overpowered untested cards like innkeeper's talent, mirrex, fountainport, cavern of souls, all the red deck aggro cards, etc. until we finally have a balanced game.
Then you slow down the production schedule go back to having a standard with 8 expansions at most and PLAYTEST ALL SETS THOROUGHLY rather than just pumping out overpowered cards without playtesting.