Not only is it a 4/5 attacker with flying, vigilance, and trample any time you want her to be, but if you want her to sit back you can turn a small creature into a threat each combat
Threat density is something you have to keep an eye on
However that simplicity belies some pretty interesting gameplay implications, and theres no better way to illustrate those complications by launching right into Summons Summons are simply a variation of Sagas that are also creatures
If you roll a die for any other reason (to simulate a coin flip, to choose pizza toppings, to create alternate timelines), that roll doesn't count
Excalibur, Sword of Eden Were the cost reduction parameters more restrictive, I wouldnt recommend Excalibur, Sword of Eden