That activated ability is sweet, but you cant just cast your fifth Templar Knight and then activate the ability unless you can give that Knight haste, so there are some hoops to jump through
That gives deckbuilders the freedom even the imperative to dedicate every other spell slot towards enabling the Petitioner plan
Ive done this many times, and its as easy as dropping Regrowth and Eternal Witness in green, or Sun Titan in white
You can run more in the sideboard, but you dont need more than one to start with since its super situational and youll only likely ever need it once if at all in a game
If you do, that player reveals the chosen card, puts it on the bottom of his or her library, then draws a card.) Let's see: better mana since you don't need double blue
They often do this by destroying all creatures, as we see in Wrath of God, but total destruction isn't the only way wraths wipe the board