You need to play small creatures, and pay one mana to do so, but in any deck that runs lots of weenies, it can help you keep chugging along
This is one classic defender, and it's one of the iconic blockers for multiplayer formats
It just uses the word, "Swamp." Another good example is extort, which has the Black and White symbols in the reminder text, or a fetchland like Mountain Valley that clearly is Red and Green in flavor and mechanically, but is allowed in decks without Red or Green
If you've ever dealt with tool-strapped, damage-resistant, stone-faced Dubwool (no really, it can happen) Duraludon will soon be your best friend
The power Mewtwo is preparing to unleash gathers in its hands, which Mochizuki cleverly depicts using motion blur to show the energy swirling around it