When Sutina enters, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Whenever Sutina attacks, you may return a land you control to its owner's hand. When you do, put a +1/+1 counter on target creature.
Sutina ramps you the moment she lands, then turns combat into a value engine: each attack you bounce a land to grow a creature with a +1/+1 counter while reusing the land's ETB. You build a mono-green ramp-and-beatdown board, leveraging landfall replays and +1/+1 counter payoffs to snowball into a lethal swing.
Built-in ramp on cast that fixes colors
Repeatable landfall triggers by bouncing ETB lands every combat
Synergizes with +1/+1 counter matters and proliferate strategies
Cheap commander (3 MV) that's easy to recast
Bouncing your own lands can set you back on mana if you can't replay them
Counter is small and slow without payoffs or doublers
Attack trigger requires Sutina to connect, vulnerable to removal/blockers
Mono-green lacks interaction and card-draw quality of multicolor decks