Last, and in my opinion least, you have the Wildcard Bundle I personally don't recommend it, but if you'd like to go down that route you can buy as many wildcards as you can afford
For instance, you pay an extra mana for the Beck half of Beck // Call compared to Glimpse of Nature, the Breaking half of Breaking // Entering mills two fewer cards than Glimpse the Unthinkable, the Burn half of Turn // Burn is one mana more than a Shock, Tumble of Rough // Tumble is worse than Pyroclasm, and so forth
I probably drew 8 to 10 cards over multiple turns from using Shimmer Dragon's ability, so it definitely made a big difference in the game
In some cases, the creature you control that is fighting may have deathtouch
It doesnt define the theme of your deck either