With Smothering Tithe in play, this makes Bennie Bracks, Zoologist incredibly effective at drawing cards
A 4/4 vigilance for four is a decent rate, and both Elf and Knight are good creature types
While there may isnt an exhaustive list of Goad cards to build a deck around, there are nevertheless fairly popular
Also, since you can't be sure of your mana needs, Five Color always runs and loves morphs, since they are a guaranteed three-drop now and find mana to flip later
But if you step back look at the card as a whole, you see that the Moat fits into a larger theme
During your opponent's turn, if you activate a Spell/Trap Card or effect (except during the Damage Step): You can Special Summon this card from your hand