Just attack with the Cactuar and use the instant to kill an opposing creature
These cards are more geared for constructed play, and that makes me giddy as a school girl
While enchantments are fairly easy to destroy, especially with cards similar to the ones above, it adds an extra step to the process for your opponents barring mass land destruction like Armageddon, which can be really helpful if you have a land in play that taps for more than one mana when you use it
You can see why she's my 4th overall top Merfolk, but hitting #3 is another Simic leader
That card doubles a creatures power and gives it trample for one green mana at the cost of having to sacrifice it at the end of the turn
Often times decks that are playing this card are usually in either mono black or Dimir colors, so many of the creatures they play are much larger than Burn's creatures (such as Tolarian Terror and Gurmag Angler) so they will survive this effect