As for the shield, Dinorphia Stealthbegia (YGOrg Translation) boasts 2500 DEF and lets you skip LP costs to activate any Trap Cards or Dinorphia effects once your LP drops below 2000
Now its become the most expensive card of the cycle, as Modern Horizons 3 has given the card at least two new homes in Modern: Jeskai Control lists, where Elegant Parlor helps players pay the Escape cost for Phlage, Titan of Fires Fury, and Ruby Storm lists, where it stocks the graveyard for Past in Flames
Axis of Mortality: Perhaps a little expensive, but will probably be worth it due to the tomfoolery you can engage in swapping around life totals
Green Goblin, interestingly, is goblin tribal, buffing up other MTG goblins when you discard cards
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Venusaur has amazing stats, so it's definitely worth your while as well