The most broken thing you can do with this card is to remove all the counters from your suspended spells, getting them quickly onto the battlefield or making your vanishing cards last longer
This can be used to delay opponents, prevent permanents from being destroyed, or even blink them for additional ETB effects
2 - Pocahontas - Peacekeeper (Iconic) The first of two Iconics from the Winterspell expansion, and I can already see why this is going to be a huge chase card for both players and collectors
Suddenly, all that discard, land destruction, and card drawing they've used has backfired, as they find themselves at a low life due to Necropotence, with two (or less) lands in play, no creatures, and no cards in hand
The ability goes on the stack before blockers are declared, which means your opponents have a window to respond