These effects can help us close out the game over time
(Create an Incubator token with four +1/+1 counters on it and ": Transform this token." It transforms into a 0/0 Phyrexian artifact creature.) Whenever a permanent you control transforms or a permanent you control enters transformed, you may draw a card
If you have a lot of tokens, this works quite well, but most aggressive decks, which usually has a lot of dragons, can sometimes play a lot of non-flying dragons, meaning they don't count there
Cards that deal non-combat damage (to any target or specifically to battles) are the only other sources that can remove defense counters on battle cards manually
Siphon Insight ($1 to $7 for Double Feature Foil) The FEA versions under $3 are likely your better target, but Double Feature has had some surprises lately
Choose a material that is sturdy enough to protect your cards from damage and that fits your aesthetic preferences