mtg portal cards If that creature is a Bird Portal of Sanctuary · Core

Plus, even if you don't manage to win the game on the spot, you're still throwing counters on your board every turn

It gives you a way to theoretically get as many extra combats as times you can manage to get an attacker through, though youll have to be okay with losing your creatures

All slivers give all other slivers the player controls - or sometimes even all slivers on the board - a specific ability

Granted, its non-tokens only, but at minimum creatures that already enter with counters come in with more, and any deck relying on counters (energy, experience, etc.) gets a steady flow of extra counters simply by playing creatures