In the Box Topper boosters, you will get a foil uncommon 37.5% of the time, a foil rare 50% of the time, and a foil mythic rare 12.5% of the time
Static Snare initially seems like a somewhat bland choice comparatively but reading the card a second time helps reveal its power
, : If a source you control would deal damage to an opponent this turn, it deals double that damage to that player instead
Any power- or toughness-setting effects that start to apply after Halsin's ability resolves will overwrite this effect
Note that unlike other Spellslingers, she only triggers for instants, not sorceries too, but Red has instant speed burn, card flow like Big Score, and removal like Chaos Warp, Blue has counters, cantrips, actual card draw, and creature removal in Pongify and bounce like Cyclonic Rift, and then Green adds in more removal like Beast Within
Even the back of the box emphasizes strength as a core component of these cards