Purchase DC Casting

Each day you have caster power equal to your caster level plus your casting attribute. In order to cast a spell, make a caster power check against a DC of [5 + 2 × Spell Level], where cantrip = 0 level. On a failure, you lose 1 caster power. On a success, the spell is cast and you lose [1 + Spell Level] caster power, where cantrip = 0 level.

The table below shows rough(small-sample Monte Carlo) averages for how many spells you can cast per day, assuming you just repeatedly try to cast spells of one level.

	Cantrip	1st	2nd	3rd	4th	5th	6th	7th	8th	9th
CL+ATT	DC: 5	DC: 7	DC: 9	DC: 11	DC: 13	DC: 15	DC: 17	DC: 19	DC: 21	DC: 23
1	7.66	4.11	2.61	1.75	1.20	0.82	0.57	0.27	0.05	- -
2	8.59	4.54	2.91	1.98	1.37	0.95	0.70	0.42	0.14	- -
3	9.56	5.02	3.21	2.20	1.56	1.09	0.80	0.56	0.27	0.05
4	10.45	5.52	3.54	2.44	1.74	1.25	0.90	0.70	0.42	0.15	<- 1st level, 16 attribute
5	11.53	6.02	3.85	2.68	1.93	1.43	1.01	0.80	0.56	0.27
6	12.47	6.53	4.19	2.91	2.12	1.59	1.14	0.88	0.70	0.42
7	13.46	7.01	4.52	3.16	2.31	1.74	1.29	0.96	0.80	0.56
8	14.54	7.49	4.86	3.41	2.51	1.88	1.45	1.05	0.88	0.70
9	15.46	8.03	5.19	3.67	2.70	2.04	1.61	1.17	0.94	0.80
10	16.56	8.53	5.51	3.92	2.90	2.22	1.75	1.32	0.99	0.88
11	17.50	9.01	5.85	4.16	3.11	2.40	1.86	1.48	1.07	0.93
12	18.49	9.53	6.17	4.40	3.32	2.57	1.98	1.63	1.20	0.97
13	19.52	10.01	6.50	4.65	3.51	2.72	2.12	1.75	1.34	1.01
14	20.50	10.49	6.84	4.92	3.70	2.89	2.28	1.86	1.50	1.09
15	21.46	11.04	7.19	5.16	3.91	3.04	2.44	1.94	1.65	1.21
16	22.50	11.51	7.50	5.42	4.11	3.22	2.61	2.04	1.77	1.35
17	23.57	12.01	7.87	5.66	4.32	3.39	2.74	2.16	1.86	1.51
18	24.49	12.47	8.16	5.93	4.51	3.57	2.86	2.32	1.93	1.66
19	25.40	13.04	8.49	6.16	4.71	3.73	2.98	2.47	1.99	1.78
20	26.60	13.56	8.83	6.41	4.91	3.89	3.12	2.63	2.08	1.87
21	27.48	14.00	9.15	6.66	5.11	4.05	3.27	2.76	2.20	1.93
22	28.52	14.56	9.51	6.92	5.32	4.22	3.44	2.86	2.34	1.97
23	29.55	14.98	9.85	7.16	5.53	4.39	3.61	2.94	2.50	2.02
24	30.51	15.52	10.17	7.42	5.69	4.56	3.74	3.04	2.64	2.09
25	31.43	16.02	10.50	7.67	5.91	4.72	3.86	3.18	2.77	2.21
26	32.55	16.48	10.84	7.92	6.11	4.88	3.98	3.32	2.86	2.35
27	33.42	17.00	11.18	8.16	6.33	5.04	4.11	3.48	2.93	2.51
28	34.47	17.52	11.53	8.42	6.51	5.21	4.28	3.63	2.99	2.66	<- 20th level, +5 inherent, +5 item